Document NeB1Jz2Qm7JBMaqLmjvRNGnbp

J ij i. I'j t- > 'T l:* C"; f !. ! ' il nr:... * I. '. i I v*. r}-<J.'-, * V.- .A-r" : . _ .. .if-.'-i.rV-c:-i:/`* ; 'V-, .?rtv :,; ... * J^r , DEPARTMENT OF MINERAL EXPLOITATION PLAINTIFFS EXHIBIT CAM-129 U N I VE R S I T Y C O L L E G E ' - CARDIFF fih M 'a id . EXHIBIT NO. _ 2 _ i - a - l (? ^ J&J-0060642 FITZGERALD00026  AN EXAMINATION OF ITALIAN MINE SAMPLES AND RELEVANT POWDERS This document represents the completion report of-the Italian mine samples and other powders supplied by Johnson and Johnson, Cosham, Portsmouth, to the Department of Mineral Exploitation. The persons involved in the examination of the material reported here were: Mr. J. Lightfoot Mr. G.A. Kingston Dr* F.D. Pooley Received: 8th September 1972 J&J-0060643 FITZGERALD00027 REPORT OF INVESTIGATION OF ITALIAN MINE SAMPLES AND' RELATED POWDERS Introduction Talc is hydrated magnesium silicate (MgaSii,Ot o (OH) s) which can occur in a number of forms. In its compact form it is known, as stealite or soapstone. The form normallyemployed for toilet purposes is soft and very friable in character. It is mined in many parts of the world including the O.S.A., Canada, France, Italy, Norway and India, as well as several other countries. It occurs in both a flaky and lath like form and the chief deposits occur in altered magnesia-rich calcareous rocks such as dolomite, marble, and magnesian limestone. The purest talc deposits occur in association with dolomite and marble. Talc also occurs in altered basic rocks such as serpentines and again as thin beds in mica schists. Commercial talcs contain a number of related mineral impurities. They may include antigorite {hydrated magnesium silicate! magnesite or members of the magnesite-chalybite series of carbonates, dolomite (.calcium magnesium carbonate!, tremolita and actinolite (calcium, iron magnesium silicates!, chlorites (magnesium aluminium iron silicates! and other minor minerals such as the sulphides and spinels. The hand specimens examined in this report were collected at the Italian mine and do not represent an average collection of specimens of material being produced at the mine. The specimens were collected with the intention of sampling those areas with obvious non talc mineral inclusions. Specimens were retained which showed differences in physical appearance, i-.e. fibrous, flakey, massive and powdery in texture. Specimens of ore in which colour variation was observed were also collected. In general the colour of the talc ore varied from grey through white to a light green colour. Obvious inclusions in the talc ore itself were retained and a careful search at the various sample locations in the talc seam was performed for fibrous amphihole minerals. Specimens of the hanging and footwall were also collected to assess their mineral content as these were likely sources of ore contamination, although the method of mining which consisted of hand filling methods precluded any gross contam ination of' the ore. The hand specimens have been, where possible, prepared for examination by the optical microscope and both polished blocks and thin sections of material have been employed. Representative fractions of all hand specimens have been reduced to powder form and subjected to powder X-ray diffrac tion examination, tThe representative powdered samples also form the samples for morphological examination by the electron microscope. ' J&J-0060S44 FITZGERALD00028 The list of samples obtained from the Italian mihe are given in Tables 1 and 2 and throughout this report the samples are referred to by the preceding code number for each, specimen* The objective of the examination has been mainly to es tablish the major minerals which .occur in association with talc at. the Italian mine. In particular to look: at the association of these minerals with the talc and especially those minerals which are of the same family as the commercial asbestos minerals, i.e. the amphiboles and serpentines. The objective of the optical examination has been to establish textural and mineral relationship and not to quantify the phases occurring in each hand specimen. X-ray work has been aimed at establishing the minerals observed by optical ' means and to produce reference patterns for future investiga tion together with computed data from pattern measurement. Electron microscope work has been selective in nature and performed on the finer fraction of the powdered specimens. Its aim has been to describe the morphology of the particles produced by comminution of the hand specimens and to investi gate any obvious structural information which might be of use in identification of individual mineral particles. Representative data obtained from the various examinations are included in the following report. J&J-0060645 FITZGERALD00029 Code No lol. 1 .2 . Io3d 1.4. Xp 5o Ic6 o I7. 1 .8 1.9. I10 X oXX o Io 1 2 . Io 13. 1*14. I.150 1.16. Iol7,, 1.18. 1.19.Io 2 0 . 1 .2 1 . 1 .2 2 . 1.23 1.24. Io 25 1.26. 1.27. TABLE 1 LIST OF ITALIAN MINE SAMPLES Description Talc from footwall contact Sorting pieces (with obvious colour differences) Coloured talc tgreen) Face 10 sample with obvious ampblbole inclusion. General ore Suspected Quartz sample Mica schist specimen 0 Massive talc Grey talc 1 st face Granular talc sample Carbonate and talc Footwall sample? Amphibolite Inclusion showing passage into talc bottom transit. Inclusion in talc seam face 4, middle of seam. Talc footwall contact Inclusion from face 1. Footwall rock sample Face 3 carbonate/talc sample Tremolite/quartz/talc sample Amphibole sample from Gianna 1""I 1212 Inclusion from face 2. Carbonate/talc sample Black gneiss 2 ft below talc seam i Talg next to carbonate face 2. Footwall limestone . Talc Inclusions Lithological inclusions face 1 J&J-O060646 FITZGERALD00030 Table 1 Continued 4 Code Ho Description X.28. 1*29* I* 30* Xi 31.` 1.32.. 1 .33. 1.34. 1.35. 1.35. 1.37. X'38. Ii 39. 1.40. 1.41. 1.42. .1.43. 1.44. X. 45. X. 48 o Quartz/talc sample Sample 6 footwall Quartz/Carbonate/talc sample Black inclusion face 1 pace 2 inclusion, from base of talc Talc from lower left end of working Marble/tunnel wall Massive carbonate from rear end of working <3rey talc specimen Carbonate in talc inclusion Pyrite/talc specimen 5" 0 pieces from crusher Platey talc Face 2, good specimen Face 1, coloured green Ctalci. Face 10, fibrous sample Face 1, pure talc? Face 1, good specimen Face 3, coloured specimen ^ i J&J-0060647 FITZGERALD00031 TABLE 2 ' 'OTHER SPECIMENS EXAMINED `Code N o . Bl B2 B3 B4 B5 B6 B7 B8 B9 Description Pure talc 1st face Greenish, talc 1st face . Talc 6 inches above footwall Talc from above inclusion Inclusion in talc Talc 2 ft above inclusion Section 2 ft above inclusion Pure talc 1st face Grey talc 1st face Also examined 1) Batch, shipments of 00000 talc 2} Old samples of British powders. i J&J-0060648 FITZGERALD00032 'OPTICAL EXAMINATION OF SPECIMENS II - 14 S Thin and polished sections were -prepared of the specimens of wallrock and, where possible, the talc ore. The minerals which formed a major constituent in at least one of- the sections were quart2 , muscovite, talc, chlorite, <var sheridanite), calcite, garnet, and tremolite? the latter only occurred as a major constituent in section 119.* Phases-- which were always minor or accessory were microcline, plagioclase, biotite, Pennine, epidote, clinozoisite, hornblende, actinolite (section 17), rutile, and opaque constituents pyrlte, pyrrhotite, and chalcopyrite. The identification of the minerals in the sections of these specimens was based on the optical characteristics of " the minerals in transmitted and reflected light, both under plane polarised light CPL) and crossed nicols (XN), combined with the results of the X-ray diffraction study of the crushed hand specimens. In some cases material was extracted from the sections and examined in R.I. liquids as in determining that the most common chlorite mineral in these specimens is a variety called sheridanite having a R.I. w equivalent of 1.590 0.005 and a birefringence of 0.012 - 0.014. Similarly much of the muscovite was nearly uniaxial with a R.I. of 1.500 correspond ing to the variety phengifce, an abnormally siliceous muscovite. In the case of talc its confident determination optically is difficult since its optical properties are identical to musco vite. However, it was found that the common "feathery" form of the talc combined with the invariable occurrence of minute transparent inclusions (suspected to be silica) in the talc producing a Musty* appearance in thin section and a greenish colour in hand specimen, enabled talc to be distinguished from muscovite. Talc also exhibited slightly higher order inter ference colours in general. Where talc was only an accessory mineral to muscovite, as in some of the wallrock. samples, then it could not be distinguished with certaintly. In the. following pages (no . 7 to 48 ) the Italian specimens are systematically described as regards their mineral composition and mode of intergrowth. Numerous photomicrographs taken under PPL and XN are provided with the description to mainly illustrate the rock textures which, it is hoped, will provide information useful in the comminution of particularly the talc ore samples, and also displays the non occurrence of asbestiform amphiboles in the talc ore. J&J-0060649 FITZGERALD00033 Specimen' TI Specimen II consisted of several pieces of wallrock with, one piece displaying the talc/footwall contact. One polished section was made of the talc/footwall contact and one thin section of the wallrock alone. The wallrock is a schist which in thin section displayed a segregation of the main minerals into thin.lenticular bands composed, as in Figure 1, of long tabular aggregates of intermixed muscovite (var. phengite) and chlorite (var sheri'da-"~ nite) , ana granular quartz exhibiting a polygonal grain boundary structure. Accessory rutile occurs as orientated inclusions in the chlorite and muscovite, and also opaque con stituents which in polished section were identified as dominantly pyrite metacrysts with minor pyrrhotite. Some subhedral porphyroblasts of plagiocla.se also occur. -f '>}. n , n v*.v .-4 : .. . f ^V*. " -, i. w : v' ' **,,V. -t , i-O.Vs -> ? -"V. . * ,..c ^ s -"v : : "x. .1.:'Xir < 1 Fig. 1. Photomicrograph, X 40, of thin section of wallrock 11 under c r o s s e d nicols. A schist of quartz (granular white-black), muscovite (lamellar yellow-blue), and chXorite (lamellar white-blueish grey). Specimen. 13; `coloured talc* The minerals composing this specimen are major talc and chlorite (var sheridanite) with the talc content much greater than chlorite, together with accessory garnet, rutile, and an unidentifiable finely dispersed phase occurring as minute transparant inclusions along the cleavage planes and grain boundaries of the talq and imparting a dusty brown appearance to the talc in thin section and a greenish colour in hand specimen. The talc occurs as medium grained feathery aggre gates which are in places rdusty* and grade into `clean* transparant aggregates which are free of any inclusions. It appears that some retrograde metamorpaic process has caused the inclusions to be removed or incorporated into the talc K f - r n n t n r s i n r a s i n n l p t a l r r r > r v c i * A l s ri i <r>l a v h n t h Tn J&J-0060650 FITZGERALD00034 3 minor chlorite is dispersed in the talc matrix as small lenticular and globular fibrous aggregates* Rare garnet, possibly a member of the ugraridite series because of its anisotropy, occurs as subhedral porphyroblasts. > i Fig. 2 . Photomicrograph, X 24, of thJLn section of 'coloured talc' specimen 13 under crossed niois. Dominantly talc (yellow-blue interference colours} showing murky brownish black, patches due to presence of fine unidentifiable inclusions. Specimen 15: general ore A coarse aggregate of curving foliaceous and feathery crystals of talc displaying evidence of shearing and translation twinning. As in specimen 1 3 , dusty inclusions of a transpa rent mineral with, a general prismatic habit occurs dispersed in the talc* As before, but to a lesser extent, the talc is cleansed of these inclusions along 20nes associated with defor mation and translation twinning, and it appears that the inclusions have either been converted to talc (as in the con version of tremolate to talc by low temperature C O 2 metasomatism) or incorporated into the talc structure as a result of retro grade deformation metamorphJLsm. Rare small subhedral garnet porphyroblasts also occur. J&J-0060651 FITZGERALD00035 9 Fig 3 Photomicrograph, x 24, of thin section of `general ore* specimen I5 under crossed nicols showing the texture of the talc, and the `murky* inclusion-rich talc compared to the clear inclusion-free talc. Specimen Is Specimen 16 consists of a very coarse aggregate of inter locking anhedxal magnesite grains whichexhibit strongly irregular and angular penetrating grain boundaries. The mag nesite is characterised in thin section, Fig. 3a, by its marked change in relief and perfect rhombohedral cleavage in plane polarised light, and very high order interference colours, Fig. 3b, under crossed nicols. Intergranular pockets of fine grained foliaceous and radiating prismatic crystals of talc together with rare chlorite Oar. sheridanitel occur. In places the prismatic clusters of talc appear to have formed at the expense of the magnesite, perhaps as a result of a retrograde thermal metamorphism with its formation being ascribed to a reaction between the magnesite and silica. One subhedral porphyroblast of plagioclase felspar occurs in the thin section. J&J-0060652 FITZGERALD00036 r rr <? 1 /; '7 *i 7-'Ty-V/.y/^r r ! .'.'ft? : A--*-,' *m s . /: * :" f' '. ' f " - \ y - i ' - r ` :->' ;*/Vih i` .i r, lm?' ...' , 1 *' '- : - : ' *'.} .*;/->' , ' - :/.. J f f y.- ' . iV . * ? ! >;'' ' V, f r t -**i *'.**.* 7 ' t.< .*>.' . V .- *. * A i&yrStU ..iJtri Fig. 3a Photomicrograph., x 24, of thin section of specimen IS under plane polarised light, consisting dominantly of magnesite with minor talc and rare chlorite. Fig. 3ba Photomicrograph of thin section of specimen 1$, mag x 24, under crossed nicois showing the occurr ence of small equlgranular and prismatic crystals of talc penetrating and interstitial to coarse anhedral magnesite. J&J-0060653 FITZGERALD00037 XX Specimen T? This specimen of walirock is a quartz-muscovite-garnet schist (Figs. 4a, 4b, and 4c) containing some accessory actinoiitef brown hornblende, talc and rare biotite. The muscovite (var. phengite) forms long lenticular bands showing a preferred orientation in a matrix of interlocked equigranular quartz grains displaying strongly irregular grain boundaries. Large euhedral porphyroblasts of garnet, forming one of the major phases, are dispersed throughout the rock.. Accessory subhedral tabular and rhombic sections of actinoiite [colourless to bluish green pleochroisxn) occur, orientated parallel to the schistosity. The actinoiite also occurs as rims to euhedral grains of rhombic and tabular outline which may have, originally been brov/n hornblende but now are pseudomorphed by what appears to be a mixture of talc, chlorite and residual hornblende. Some talc is present as small pockets within the muscovite layers but this identification is based on the form, the lower refractive index and the occurrence of dusty inclusions. The colour, birefringence etc. of the talc is otherwise the.same as muscovite. In polished section the main opaque accessory mineral is pyrrhpfcite occurring as subhedral laths lying parallel to the schistosity. Traces of chalcooyrite also occur, and some rutile rods mainly as inclusions in the garnet porphyroblasts. Fig. '4a Photomicrograph of polished section of 17 showing . pyrrhotite (.white) , garnet (light grey), and muscovite-quartz (darker grey). Very dark, to black areas are pits in the surface. J&J-0060654 FITZGERALD00038 12 - Fig 4b* Photomicrograph., mag* x 40, of thin section, of I7 consisting of garnet, muscovite and quartz under plane polarised light. Fig 4c Photomicrograph, mag. x 40, of thin section of 17 under crossed nicols .showing subaedral garnet (black), anhedral interlocking cuartz (white-greyblack.) , and lamellar muscovite (coloured) J&J-0060655 FITZGERALD00039 Specimen Ig In hand specimen Ig appears as a coarse aggregate of foilaceous talc varying in colour from white to greenish, white*' The general texture in thin section is of coarse foliated talc preferentially orientated and alternating with, long lenses of a finer talc in which a preferred orientation appears to be absent as a result of shearing parallel to the schistosity* Minor chlorite (var. sheridanite) occurs as orientated laths intimately intergrown with the coarse talc.and as fibrous aggregates in the finer talc lenses. Rare anhedral garnet, possibly pyrope, occurs. In thin section the talc which appears greenish in hand specimen is seen to be crowded with minute inclusions of a pinkish, mineral occurring as rounded to thin tabular grains and having a lower refractive index than the talc. A grey-brown amorphous material is also present. This material together with the granular inclusions is presumably responsible for the greenish colouration of' the talc in hand specimen. As in 13 and I5 the greenish talc has been cleansed of inclusions along planes parallel to the schistosity by some later metasomatic process or retrograde metamorphic process. This 'absorbtion' of the inclu sions by the talc or removal of the inclusions, does not effect the form of aggregation of the talc crystals. Boundaries between the clean transparent and 'murky' talc often transgress the schistosity and there is no change in the coarseness or mode of aggregation of the talc across such boundaries. X-ray diffrac tion of the transparent white talc and the translucent greenish talc revealed no differences and the composition of these inclusions is at the moment unknown. Figure 5, under crossed niois, shows such a transgressive boundary between the clear and. `murky* or dusty talc-. Fig. 5. Photomicrograph, mag x 24, of thin section Ig showing the nature of` the talc intergrov^th under crossed nicols, and the tranr.grcr.nivc boundaries between, clear trans parent talc ami the incLmti.on-rLeh 'nun*fey* talc wlilclt appears greenish white in hand specimen. J&J-060656 FSTZGERALD00040 14 Specimen I g : 'Grey talc 1st f a c e 1. In specimen Ig talc and chlorite (var. sheridanite) are the main constituents* They occur intimately intergrown as long orientated foliaceous aggregates alternating with finer platy aggregates in which, the talc and chlorite fibres are randomly orientated and which form lenses elongated parallel to the. schistosity of the coarser foliaceous talc [Figs. 6a and 6b)* a s in previous sections the talc appears murky in parts due to the presence of minute unidentifiable inclusions. The talc is also crowded with small irregular and rod shaped grains of rutile . Rare subhedral porphyrohlasts of garnet (possibly pyrope) also occur. 3K>. Vw'^Vv'wS.'-> i..! yjg- 6a - Photomicrograph., x 40 mag, of thin section Ig under plane polarised light showing subhedral garnet grains in an orientated foliaceous aggregate of talc and chlorite. J&J-0060657 F1TZGERALD00041 15 ;-V- -i; '''`V,V?;V -'\ '`'X V ? X r'Si-v:'v':- \ ' v:X,'-!. V - X V - -'" '.*.' 'A i *vj V.4X " ' ' * - -tr- <h. X X X x v. .V ' X O 1 V -\ . X ' '~-i h Y V.-. .-*'"\Vy---v,*4 ';. :*>vt-.r - . l* w,,* * ' :v;?\x <v*:-*f...' - ; :-X Tig Photomicrograph., x 40 mag., of thin section I g it under crossed nicols showing garnet (.black) j f in a coarse matrix of foliaceous talc {bright interference colours) and chlorite (white to blue-grey interference colours). t }% i J&J-0060658 FITZGERALD00042 16 Specimen' -Im and' * *granular ta lc * Both. X xq and I^OA consist of an intergrowth, of medium grained and randomly orientated major talc with minor chlorite (var. sheridanite) (Fig. 7). Some small porphyroblasts of garnet also occur scattered in the talc/chlorite ground mass. In. this specimen the talc is not crowded with inclusions as is the case in most of the other samples. Fig.' 7 a Photomicrograph, x 40 mag., of thin section I10, under crossed nicols,- consisting of talc (blue and yellow interference colours), chlorite (white and greys), and garnet (black). Specimen Xll : *carbonate and talc * Specimen I n consists dominantly of a mosaic of coarse to fine grained anhedral interlocking magnesite grains with interstitial pockets of coarse to medium grained foliaceous aggregates 'of talc (Figs. 8 a and 8b) . . The talc is crowded with near sub-microscopic inclusions of a transparant phase together with a brown amorphous material which causes the talc to appear dusty or turbid in thin section. Some fibrous chlorite (var, sheridanite) occurs as small pockets intergrown. with the talc. Traces of rutile and pyrite occur. i J&J-0060S59 FITZGERALD00043 I Fig/ 8a Photomicrograph., x 24 mag., of thin section under plane polarised light showing a sufahedral pyrite metacryst (black.) in a matrix of compact -granular magnesite with interstitial foliaceous talc Ctop centre)D . v-> "if. '- , J'. ~ i> ... . n v {; J -v,. '4u`-XLy'*.*>i. -1, S'- \A*, TV " -.>-F - r - .; - - v-x/- ,;M ^s-t y , r - y Jr. L,\ , / - si#r*v;4"i&.. .H --V C-; : - ? Ati5 ;^ * Fig. 8b . Photomicrograph, x 24 m a g . , of thin section I n under crossed nlcols showing a pyrite motacryst (black.) In n gr.imilMi* mngnnnLt.n matrix, with a foliaceous interstitial aggregate of talc (top centre)o J&J.0060660 FITZGERALD00044 18 Specimen I t q A n aggregate of anhedral quartz as the main constituent with, minor interstitial muscovite and green chlorite (var. _ Pennine) Fig. 9. The long muscovite laths -show-a-preferred ` orientation. Chlorite occurs in interstitial pockets as randomly orientated platy grains. Some epidote is present and a trace of magnesite. The chlorite displays a pleochroism from light green to brownish-cream, and anomalous blue interference colours in some cases. However, most of the chlorite grains display lower second order to upper first order interference colours. Thus a range of chlorite composition is probably represented in the section. Fig. 9. Photomicrograph, x 40 mag., of thin section I]_2 under crossed nicols. Specimen I1 3 This specimen consists of an aggregate of mainly medium grained platy to fiorous chlorite [var. sheridanite) and aguigramiiar quartz.' These two enclose ragged replacement residuals of calcite and subhedral metacrysts of pyrite with rare' chalccovrite. J&J-0060661 FITZGERALD00045 19 k5: kd ^ . v* w,|fv.Av-v,1y,'9?Sfc ; V .( %?-7- t f e i y / ' n .>r\. ., , , i \ - . " ' : f:=- Fig.' IOa Photomicrography x 40 mag. # of thin section 1 X3 under PPL showing subhedral perite meta- . ' crysts (black.) in a matrix of dominantly chlorite and quartz with minor calcite. Figy :iOb i Photonticrograph, x 40 mag., of thin section 1 X3 under KM showing chlorite (fibrous v/hite and grecnish-grcy) and calcito (coloured) enclosing subEiodraX grains of pyrlLo (black) . Equigranular grey grains are quartz. J&J-0060662 FITZGERALD00046 Specimen I , - . This specimen is dominantly composed of very coarse grained : magnesite enclosing minor amounts of talc and very minor * chlorite "(var sheridanite). The talc"and chlorite form pockets of radiating lamellar and foliaceouu crystals au In Figs* 11a, 11b. Fig*- H a ' Photomicrograph., x 24 mag., of thin section 1-,A under PPL of coarse magnesite and/intergranular pockets of 'dusty1 and 'clear' talc. >r-H --:; -y Fig. lib ' U. V \ v ;,K 4 r- .. y -- v,. y y. . - >. v *- - *-- * ' ` . ..y . AV.v- 'v x V^:.v.- -.^v/ ' ' "A V. i ' - Usf ..V'-- * . it 1 a Photomicrograph, x 24 mag., of thin section I1 4 under XN of magnesite (greenish) and pockets of radiating lamellar talc (.blue, purple, yellow). J&J-0060663 FITZGERALD00047 21 Specimen' I-i *' This specimen of wallrock is- a garnet-muscovite-quartz schist with minor green chlorite, biotite, and rare talc and feldspar (Figs. 12a and 12b). The garnet occurs as large Cl-3mm diarn.) porphyroblasts altered along irregular fractures to a mixture of greenish chlorite, biotite, and some feldspar, and enclosed in a matrix composed- of orientated tabular grains of muscovite, forming elongated lenses, and alternating with 'mosaic1 granular quartz containing randomly dispersed biotite and chlorite flakes. * i < i r * ' - ;-:i a '>. V * r ' u a--.- '->v -< *.: \ ' : Jci,??v?v .;v i T V : : . ... :1 ^ c V > ; A c ' = - ..--rv ....f \ .v- .". 'X.'. V M- t' :?& ! "H-> \vNVy K f > ' ? \ j V V : b - < c:fx^:v^v `/s.-i -t Flg.~ 12a Photomicrograph, x 24 mag., of thin section Iisa. u n d e r PPL showing a large altered porphyronlast of garnet in a matrix of dominantly muscovite with minor quartz. J&J-006D664 FITZGERALD00048 22 'fc' <*=* *vq- *, > '* v H h; ''' r-,- ' ! .4 ."S -... . ' : &-V: Zv r 1":!;'r' & 'V*W<,\>- --,>'_.v1 \ `-s s>*.. ? / ..V F ^`W. t .' y` . i \ * " A ' .. - '* F ,' .* ' - A ; V c V ^ 4 H ' > 1 ,`V-'? '<-y .*i,"c . Fig. 1 2 b t Photomicrograph., x 24-mag. r of thin section II5^ under crossed niois. Garnet Chlackl. Muscovite (dominantly purple Interference colours). Quartz (white and greys) t J&J-D060665 FITZGERALD00049 Specimen Iyt; This specimen, is dominantly composed of chlorite (var* sheridanite) and' craartz- as orientated aggregates producing a schistosity* Very minor amounts of magnesite and talc occur The talc occurs as thin laths, intergrown with the chlorite (Fig* 13b). . Fig' 13a Photomicrograph, x40 mag*, of thin section 1^5 under PPL showing the irregular but preferred elongation of granular auart2 segregations in a matrix of fibrous chlorite "tvarT sheridanite) ,,% .r*** i >*/S ; <s; a <.> i......A Fig 13b Photomicrograph, x 40 mag, of thin section I1 5 under XN, composed of chlorite ffibrous white, greenish grey, black.), quartz granular white-grey-black) , and talc (blue, red, and yellow interference colours) J&J-0060666 FITZGERALD00050 24 Specimen Iig : `first face inclusion' This specimen is composed of `a medium grained aggregate of dominantly chlorite (var. sheridanite) and quartz , with minor magnesite,' clinozoisite,' talc, and muscovite, and displaying a poor schistosity. Scattered euhedral to subhedral pyrite raetacrysts occur as well as medium grained crystal aggregates of rutile associated with clinozoisite forming' 'stringers' parallel to the general schistosity of the rock* In. the photomicrograph of figure 14a the brownish speckled* areas are dominantly chlorite although in Figure 14b talc and muscovite are more apparent because of their inter ference colours* , v ii'- '.v- ' j ' l . ' ; - - ' \ = - "V rv ^ *>-/?, \ 'r^y*;. =1 . *r- * .........-.1.-......j..v.--....... .***. . T ' ^ v ,, ' ` `: Figure 14a Photomicrograph., x 40 mag., of thin section ,, under PPL. i < J&J-0060667 FITZGERALD00051 -O '' T V -v':'wY'; ^ ' ^ / - . //. .- . . ^ , ' z ; y j ^ f'-/ '.-C--1" '^/';?''*'^- * i ' i i . ' . T ? " .-I " . ' i '/ . ^" ';, . '' >Q . V 'ii'fcL ' ' . ' \f . ^-1V'.vv-,v-^. - V v"Y~. /,.. ! :*$- ': *V. ' ^ l**' ! *'' - , < y -'.,^V.i* .- * - 0 ,- -i > is\__ '` V"-. '% t f ) Fig* 14b Photomicrograph, x 40 mag. r of thin. section I^g under crossed nicols. A chlorite - quart2 rock with minor talc and muscovite, and accessory magnesite, clinozoisite, rutile and pyrite. A 4 J&J-0060668 FITZGERALD00052 Specimen I t -?: footwall' This specimen of footwall rock is a muscovite-ouartzgarnet schist consisting of long lenticular anhedral quartz aggregates. Both, are enclosing fractured and altered euhedral porphrohlasts of garnet. Accessory sphene also occurs as well as serpentine-quartz pseuclomorplis after a mineral dluplaying rhombic and tabular soctlons,- T> Pig. 15a Photomicrograph., x 24 m a g . o f thin section I1 7 under PPL showing garnet euhedra in a matrix of segregated quartz and muscovite. S "1*. ; - ---V 'V * ',ww*0 i '* -5., *: * 3 _ V ' f jkf* 'i;`a :;C ::v-..c J r- ` V . JVrf***' ,A i A "^ ->t ' \ - Nt.;./ I- -*.;w V V i >. \c.. v '* -vs*1 /O \ .'MV...~^'^1>*HI Fig. 15b Photomicrograph., x 24 mag., of thin section. Il7^under -- XN. Gatnet (black.) quartz (white to grey) t and muscovite (lamellar and coloured). J&J-0060669 FITZGERALD00053 ` Specimen' 1-^t Face 3, carbonate/talc* A coarse to medium grained aggregate of subhedral inter- locking grains of magnesite with, minor ta'ic occurring as scattered small interstitial clusters associated with, rare chlorite (var. sheridanite) and muscovite (Fig3 ,, 16a, 16b), W m **.?4 Fig, 16a Photomicrograph, x 24 mag,,, of thin section Ii8 under PPL of granular magnesite with., scattered tabular crystals and clusters of talc. Fig. 16b .* Photomicrograph, x 24 mag,, of thin section rig under XN of granular magnesite (.high order interference colours, vand scattered tabular crystals and clusters of talc (top right, coloured.) and rare chlorite (white.to blue--grey colours). J&J-0060670 FITZGERALD00054 specimen X i q Thl$ specimen'consists of an aggregate of coarse grained aniiedral magnesite intergrown with solitary bladed crystals and crystal aggregates of tremolite associated with minor amounts of fine fibrous talc and rare anhedral grains of quartz (Figs, 17a, 17b). Fig. 17a Photomicrograph., x 24 mag., of thin section of ' t under PPL, showing coarse bladed tremolite inter grown with very coarse grained magnesite. Fig. 17b Photomicrograph., x 24 mag., of thin section. I^g under crossed nicols showing coarse bladed tremolite and' anhedrai coarse-grained magnesite with minor small fibrous aggregates of talc . (top left).. J&J-0060671 FITZGERALD00055 Specimen -I?! ; 1Inclusion, face 2* Specimen I2 1 is composed of a fine grained interlocking aggregate of anhedral magnesite, as the major constituent, associated with scattered laths and interstitial fine-grained fibrous aggregates of very minor talc (Pigs. 18a and 18b), Fig* 18a Photomicrograph, x 24 mag., of thin section I2 1 under PPL. Magnesite with rare talc. :: V ^ v ` ,, 'j 'V, -kJrfc* a ' " Fig. 18b ^ *. ` i*- I "' f-*. . 'i~**~J V `f ' av i Photomicrograph, x 24 mag., of thin section I2 1 under crossed niois. Magnesite with rare talc. J&J-0060672 FITZGERALD00056 30 Specimen X??. This specimen is dominantly composed of coarse subhedral to euhedral interlocking grains -of magnesite associated with intergranular fibrous clusters of talc which often enclose smaller euhedral magnesite grains XFig. 19) ' ^ --- Fig. 19 Photomicrograph, x 24 magnification, of thin section I22 under plane polarised light* Magnesite and interstitial aggregates of talc. > t J&J-0060673 FITZGERALD00057  Specimen' 1-23 s 'Black. Gneiss 2* below talc vein Specimen 123 consists dominantly of medium grained anhedral interlocking quartz as orientated bands enclosing large micro- ' cline anfiedra and anhedral -aggregates. Scattered platy aggregates of muscovite occur orientated parallel to the general direction of the quartz banding. Minor epidoto and cli tort tn also occur (Figs. 20a and 20b). - Fig. 20a Photomicrograph, x 24 mag., of thin section I23 under P P L. Quartz--muscovite-microcline gneiss. *; -V* 'v ;n,/ ' v\ . ; -* A ~ "v IV firr 3 ,< l Fig. 2Qb Photomicrograph, x 24 mag., of thin section I23 * under XN. Quartz-muscovite-mlcrocllne gneiss. J&J-0060S74 FITZGERALD00058 Specimen I?-j:-,.;--rFaca 2, Talc.next to carbonate1 This specimen of talc ore consists dominantly o f coarse fibrous talc with minor chlorite Cvar. sheridanite} occurring as small lenticular fibrous aggregates within the main mass of talc (Pigs* 21a and 21b), A few small subhedra of garnet are present. As in previgus specimens there are two forms of talc present: (1) a talc that in thin section appears brown (Pig.21a) under plane polarised light due to finely dispersed dusty inclu sions of a transparant mineral and a brown amorphous material, (2 ) a clear transparent talc free of inclunions which appear to have*been formed at the expense of the other by some metauomatic "cleansing* process. Talc crystals in.optical continuity can bo seen to change sharply from `dusty* brown talc to the clear talc Fig.21a Photomicrograph; x 24 mag . , of thin section 124 under ' " p p l # "Dusty* and clear talc enclosing small lenticular aggregates of chlorite. . Fig.21b Photomicrograph, x24 mag., of thin section I24 under XM. Coarse talc with lenticular aggregates of chlorite. J&J-0060675 FITZGERALD00059 i t; .h 1 Tills specimen of footwall rock, consists of an interlockingaggregate of medium grained anhedral `quartz enclosing occasional large anfiedra of microcllne feldspar (Figs. 22a,22b), Minor magnesite occurs as pockets interstitial to the quartz, and also scattered laths of muscovite. Green chlorite (pennine)and epldote occur in trace amounts. Pq. 22a Photomicrograph, x 24. m a g ,/ of thin section I25 under PPL; dominantly a quartz~microclina rock. with, minor muscovite and rare pennine and epidote. [.I >_I- 0 \ -- -----a.. ` - Pig. 22b Photomicrograph., x 24 mag., of thin section. I25 under XN_ J&J-0060676 FITZGERALD00060 Specimen I2S T h is , specimen contains chlorite, talc, magnesite and rutile One part of the thin section consisted of a massive coarse~ fibrous and feathery aggregate of talc enclosing pockets of ' coarse magnesite. This texture graded into one which was dominantly fine grained chlorite (var. sheridanite) intimately intergrown with minor quantities of fibrous and platy talc (Fig. 23)'as well as scattered small equigranular and rod-shaped rutile crystals. 4 * 9 ygv-'230 Photomicrography x 40 mag., of thin section I2 S under crossed nicols showing minor talc (colqured) inti mately intergrown with major chlorite. t J&J-0060677 FITZGERALD00061 Specimen 127 Specimen I2 7 is dominantly compo&ed of quart2 , chlorite (var. sheridanite) and talc (Pigs. 24a and 24b). Thin lenticular bands of course feathery Laic and chlorite alturuAtu with anhedral granular interlocking aggregates of quartz. Scattered inclusions of rutile and opldoto occur, uu well au occasional large taicrocliim anhedru. Pig, 24a Photomicrograph, x 40 mag., of thin Section 127 under PPL, showing a fibrous and feathery aggregate of talc and chlorite enclosing anhedral segregations of quart2 vW Lg. 24b Photomicrograph,'x 40 mag,, of thin section 127 under J&J-0060678 FITZGERALD00062 Specimen I2 9 36 Specimen I29 is a gnelsslc rock consisting of segregated bands of medium to fine interlocking anhedral quartz grains 'alternating with, minor muscovite as'orientated platy clusters and enclosing large microcline anhedra. Some rare Pennine . and very rare epidote occur intergrown with the muscovite* Pia* 25a Photomicrograph, x 24 mag./ of thin section I29 under -- PPL* quartz, muscovite, and microcline (top left) fc. - ... U ' $ . v :: '/ v1 ' -(/ O *' ,1I?'t* v`, . , / p; ir: . \ - \V *^ h - ' I/V: .* t 1 J,,. iri". *p , .-Ji _t.> .- ' A*-. * *4 Pig, 25b Photomicrograph, x 24 tnag, of thin section I29 under -- - ---- X N J&J-0060679 FITZGERALD00063 Specimen I3 1 '' 37 - Specimen lax is 3 muscovite-quartz schist containing minor Pennine, sphane and tremolite. The rock, is dominantly made up of coarse orientated lamella segregations of muscovite intergrawn with flakes of minor green ish. brown chlorite (ponnlno) and eucloulng oiitmUrnl to uiibliudiai grains of sphene. Minor interlocking' fino to medium grained quartz segregations occur alternating with the muscovite bands* Hexagonal sections of an ainphibola, probably tremolite, occur dispersed in the muscovite matrix. ; i, a , . '/- 'v> ' -A X . v Xvil t\/ ilk,--4 >-!cf r--." k*A-'V- * X A ,x '* ``X i K\ r * ` Li--'*-.*. ''v. V* V ' i V V * . '} Pig. 26a Photomicrograph, x 40 mag., of thin*section I 3 X under PPL; muscovite-quartz schist. Pic. 26b Photomicrograph., x 4o mag*, of thin section 131 under XN; muscovite-quartz schist. J&.J-0060680 FSTZGERALD00064 30 Specimen I3 7 This specimen consists of coarse feathery lenticular aggre~ gates of dominantly chlorite (var. sheridanite) intimately intergrown with minor amounts o f talc (Figs. 27a and 27b). Small inclusions of rutile occur along the boundaries (shear planes) between the chlorite aggregates and also along chlorite cleavage planes. Finely dispersed submicroscopic dusty inclusions of an unidentified phase similar to that found in talc occur in the chlorite. Flo. 27a Photomicrograph, x 24 mag, of thin section I32 unde*: XN. Feathery.aggregates of sheared chlorite (white to greenish grey to black) with, minor talc (coloured) . Fig. 27b Photomicrograph, x 24 mag,, of thin section X 32 under XNo Finer grained chlorite-talc mixture. J&J-0060681 FITZGERALD00065 Specimen In This specimen of talc ore consists of a medium to fine grained' randomly orientated intergrowth, of dominantly talc with, minor' chlorite (var0 sheridanite). The chlorite is intimately mixed with, the talc (Fig. 28), Some pockets of coarse interlocking anhedrai magnesite grains occur enclosed by" the talc-chlorite matrix. Fig..28 Photomicrograph, x 24 mag., of thin section I3 3 under XN. 1 J&J-0060682 FITZGERALD00066 40 Specimen I35 This specimen consists dominantly of magnesite as a very coarse to medium grained interlocking aggregate of euhedral to subhedral grains. Minor tremoiite- occurs as long prismatic crystals forming interstitial clusters, and as solitary crystals penetrating the magnesite and along the grain bound aries of the magnesite. Minor chlorite (var, sheridanite) and rare talc occur associated with the tremoiite segregations (Figs, 29a, 29b}. '*-* / f t .. r --`-1 T " i ' jL '- J ' V w *L.*iO ^ i i t u t V , .n i ^ * ~ H s l 29a Photomicrograph, x 24 mag., of thin section I3 5 under PPL. Magnesite-tremolite-chlorite--talc rock.. Fig.'"29b Photomicrograph,- x 24 mag., of thin section I3s under Xil. rrir.matic tremoiite in magnesite in tho extinction position. J&J-0060683 FITZGERALD00067 Specimen 1 37 This specimen consists dominantly of magnesite with, minor talc The magnesite occurs as an aggregate of very large magnesite anhedra enclosed by finer grained subhedral magnesite which is intergrown with feathery intergranular clusters of talc (Fig* 30}. Fig. 30 Photomicrograph of thin section. 1 3 7 , x 24 mag., under XN showing the finer intergranular magnesite associated with small laths of talc (fibrous and coloured]. i J&J-0060684 FITZGERALD00068 42 Specimen This specimen is dominantly composed of talc forming coarse feathery aggregates intimately intergrown with minor finer grained chlorite (var. sh.erldan.ite) and containing fine disseminated inc lusions of rutile. Occasional fine grained quartz as well as larger oval-shaped augen of quartz and rare garnet occur scattered throughout the talc matrix. The talc is for the most part crowded with, inclusions, as in previous sections, but elongate areas of `clean* talc occur as in Pig. 31a. Fig. ~31a Photomicrograph, x 24 mag., of thin section I39 under PPL h-.>, v . **. 1tt -- , ^ 1. 1. \ .'- \ Fig. 31b t * . ' S f . v ^v ' -4 I* ^ |Iu & . . k t ' .l C h J " '-'C1- _% 1 .*-'/ \W Photomicrograph, x 24 mag., of thin section 1 3 9 , under XN J&J-0060685 FITZGERALD00069 t Specimen I<n I i This specimen of talc ore consi sts of a coarse aggregate ' of feathery talc Intimately intergrown with minor' chl'orite | <vare sheridanite), and enclosing rare large porphyroblasts ; of subhedral garnet which, occasionally contain long prismatic inclusions of tremolite (Fig. 32a) i ; : ! ' f 5 i Jig*-32a Photomicrograph, x 24 ma g . , of thin section I4 X i . w.-* under XN. Feathery aggregate of talc'with, garnet - f porphyroblast (bottom right, black). - > I i j i i J&J-0060686 FITZGERALD00070 Specimen I4 2 s *No.l Face, green coloured* Spcimen I42 consists dominantly of an aggregate of fine grained fibrous chlorite (var. sheridanite) intimately inter-grown, with, minor very fine grained talc as in Fig, 33, I J ' r i t ' " t i`^Vw'>^r't, > \ L ^ - s X s . ' . l i t -4 Fig, 33 Photomicrograph,-x 24 mag,, of thin section I42 under crossed nicals of chlorite (white, greenish grey, black. ) , and fine grained talc (yellow). 1 J&J-0060687 FITZGERALD00071 45 Specimen' 1 4 3 - *Face 10 fibrous sample* Specimen 1 4 3 consists dominantly of chlorite tvar,sheridanite), occurring in the form of a coarse sheared fibrous aggregate intimately in tergrown with very minor talc as in Figure 34 * Fig. 34 Photomicrograph, x 40 mag., of thin section I43 unde crossed nicols showing deformed fibrous chlorite Cwhite-greenish grey-black) intergrown with platy and prismatic crystals of talc (coloured),,' Specimen I43A As for I43 the specimen consisted dominantly of chlorite (yar, sheridanite} with very minor talc, The `cross fibre* type texture found in 1 43 and produced by shearing at right angles to the schistosity was absent in specimen I43&. J&J-0060688 FITZGERALD00072 Specimen lad; `First face pure talc1* A coarse aggregate of lamellar talc showing a preferred orientation and enclosing augen of what appears to be an intimate intergrowth- of guart2 and serpentine (Fig, 35). Both talc crowded with, fine unidentified inclusions and `clear* talc are present. See also description for I4 5 * * Photomicrograph, x 24 mag., .of section' I 4 4 under cfossed nicols showing coarse lamellar *talc enclosing rare anhedral segregations of probable serpentine-quartz composition. i J&J-0060689 FITZGERALD00073 'E22E5-451 `Nool good specimen1 , This specimen of 'talc ore1, consists nearly wholly of talc occurring in the form of a randomly orientated 'matted* aggregate of fibrous talc enclosing minor guartz-serpentine augen As in previous sections the talc is rendered murky or dusty b y fine inclusions of a brown amorphous material and an unidentified transparent phase. In places the talc has -been cleansed of these inclusions along zones which appear to be independent of any intergrowth or crystallographic features of the talc (Pig. 36). Jc * 1? Vi `- f F l i *v ` . V:'. - ' iKeHw^i-* i- . S V ' Jv-1 *. A : \ Fig, 35 Photomicrograph., x 24 mag., of thin specimen I45 under crossed niois showing the form, of aggre gation of the talc and the difference between the `murky* talc and the linear transgressive zone of clear* 1 talc. J&J-0060690 FITZGERALD00074 Specimen X *Noe3 face, coloured* This specimen consists of very coarse lenticular aggregates of long fibrous and feathery talc crystals enclosing rare anhedra! porphyrobiasts of garnet ( J&J-0060691 FITZGERALD00075 49 DIGESTIVE TESTS To confirm the presence of acid soluble carbonate'itiaterial and also to help identify the type of carbonate present in the rock specimens collected,each powder specimen was subjected to a digestive test* Half gram quantities of each of the powders were treated with normal hydrochloric acid for several hours at approximately 70C* The residues were reweighed and the filtrates were analysed for their calcium and magnesium content using the F.ELP 240 atomic Absorption Spectrophotometer * The aim of the digestion was not to estimate the total acid soluble fraction only to help establish the carbonate minerals present and to estimate, roughly their quantity to help interpret the X-raypowder photographs obtained from the samples. The results are present under- three headings, namely *Rock. Types*, 'Carbonate Specimens*, and 'Talc Specimens*. It can be seen that only small quantities of carbonate, material are present in the talc specimen group, similarly in the rock specimens with the exception of the marble specimen which is practically 100% calcit'e. The carbonate group of specimens appear to be mixtures of calcium and magnesium carbonate with a number of specimens being possible .dolomites. J&J-0060892 FITZGERALD00076 L Specim en No. IX 17 112 113 115 116 117 120 123 125 127 129 131 134 Specimen No* 14 16 111 114 118 119 12 1 12 2 130 135 137 Specimen NO. 12 13 !5 , 18 19 no 124 126 128 132 133 136 ROCK TYPES % Weight Loss <0 .2 % 3.0% <0 .2 % 4.2% 6 .0 % 4.8% 6 .0 % 1 1 .2 % 1*4% 22.4% 9.0% . 3.6% 9.6% 92.2% % Calcium <0 .2 % <0 .2 % <0 ,2 % 1 .0 % <0 .2 % 2 .0 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % . <0 .2 % . <0 .2 % . <0 .2 % >2 0 .0 % . % Magnesium . <0 .2 % <0 ,2 % <0 .2 % 0.4% 0.4% 0.4% <0 .2 % <0 .2 % <0 .2 % . <0 .2 % <0 .2 % <0 .2 % . <0 .2 % <0 .2 % CARBONATE SPECIMENS % Weight Loss 2 2 .8% 48.0% 2 1 .6% 44.2% 75.2% 37.8% 61.8% 91.2% 15-.0% 50.8% 51.0% % Calcium 3.0% 6 .0 % , 3,0% 7.0% 14.0% 5.0% 8.4% 16.0% 1.9% 6 .6% 4.4%' TALrC* SePuErCrTIMMPEMNeS .% Magnesium 1 .1 % 1.15% 6.4% 5.0% 24.0% 4.0% 8 .0 % 15.2% 1 .6% . 13.4% . 24.0% % Weight Loss 3.6% 1 .6 % 5.4% 6 .0 % <0 .2 % 4.2% 8 .0 % . < 0 .2 % ` 1 2 ,6% t 1 .2 % 5.6% 4.6% % Calcium % Magnesium . <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2% <0 ,2 % <0 .2 % 0.34% . <0 .2 % 0.4% <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % < 0 .2 % ' < 0 .2 % 0.4% < 0 .2 % < 0 .2 % /Continued..* J&J-0060693 FITZGERALD00077 51 TALC SPECIMENS (Continned) Specimen No* 138 139 140 141 142 143 144 S45 % Weight Loss 1 .0 % <0 .2 % 7.0% . <0 .2 % 0 .8 % 6 .2 % .<0 .2 % 8 .0 % % ' Calcium <0 .2 % <0 .2 % <0 .2 % . <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % % Magnesium <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % <0 .2 % . <0 .2 % .<0 *2 % i J&J-0060S94 FITZGERALD00078 Electron Microscope Examination of Italian Mine Samples and Imported Batch Shipments of Italian Powder The main purpose of the electron microscope examination Of mine samples and also representative fractions of the Italian powder has been to establish whether or not any particles corresponding to the commercial forms of asbestos were present. The electron microscope is an instrument which is most usefully employed in the examination of particles less than ten microns in size. It has been used In this investi gation therefore to examine only the finer particulate portion of the Italian samples. It may be argued that only a small fraction of each of the powdered samples was examined and that this was not representative of the total sample. However, we can assume that the fraction examined was representative of the dust formed from each sample and that it is this finer fraction which is the most important from a biological stand point. Also as the size of the biologically active commercial asbestos particles fall entirely within the particle size range examined we can consider the main aim of the examination to be entirely satisfied by only looking at the finer fractions from each of the Italian samples. To acquaint ourselves with the type of particles formed by the commercial asbestos minerals, Figs. A-D have been included. They represent samples of Amoslte, Crocidollte, Anthophyllite and Chrysotile asbestos. Also Figs. E-F have been inserted to demonstrate typical single particle electron, diffraction patterns which can be obtained from the four asbestos types for comparison with patterns obtained from the Italian samples. Sample Preparation Small portions of the powdered rock samples and imported powder specimens were placed in 15cc centrifuge tubes to which distilled water was added. The powders were then dispersed first by hand shaking and then with the aid of a small ultra sonic bath.- The concentration of suspended material in the tubes was adjusted by eye using dilutions of distilled water. The tubes containing suspended solids were then allowed to stand for 20 minutes to allow the larger particles of mineral to sediment to the bottom of the tubes. Electron microscope grids coated with carbon films were prepared and small drops of the particulate material from each of the specimen tubes were mounted on specimen grids and allowed to dry. The specimens were inserted into an A.E.I. E.M.6 . electron microscope and examined for particles resemb ling commercial asbestos fibres. Where suitable particles were observed, selected area electron diffraction patterns v?ere taken and compared 'with those produced by the commercial asbestos minerals. In all cases photomicrographs representative of the type of particles found in each sample were taken while interesting diffraction patterns were also recorded. J&J-0060695 FITZGERALD00079 53 Particle Morpholocry The carbonate rich materials were found to produce compact particles which were very electron dense. On the whole they were finer particles than those obtained after crushing talc rich specimens. No fibrous material whatsoever was found when carbonate material only was comminuted. The morphology of particles produced from the footwall rocks i.e. limestone, marble, gneiss and the amphibolites were also very compact, although in the gneiss specimen platey parti cles were present probably representing the muscovite content of the specimen. Again in the footwall rock specimens fibrous particles were very scarce. Those lath like partir d e s detected resembled the amphibole minerals rather than chrysotile. Selected area diffraction patterns which were obtained from the lath like particles in no way resembled the typical amphibole fibre diffraction pattern. They were generally very distorted patterns containing streaks rather than spots indicating a rather stressed and deformed material. The specimens which were composed of talc together with other mineral associations, presented a very different picture, as far as particle shape was concerned. In the main parti cles were flat and plate-like, some being very thin and translucent in the electron beam. Particle sizes varied from very small to quite large plates some with very sharp discrete edges, others with rather ragged outlines. Comparing parti cles from those samples of talc which varied in bulk morphology in band specimens, no observable difference could be drawn between them. Similarly, a comparison of particles produced from talc specimens of varying colour revealed no differences in the overall particle shape. Similarly those specimens rich in chlorite did not form particles with any distinctive features. There were, however, observable differences in particle morphology between individual powder specimens. In the main most produced good plate like particles, however, one or two specimens were found to contain considerable numbers of lath like particles, these being very thin in character. These particles resembled the amphibole asbestos type particle being less regular and also very much larger in projected diameter. Diffraction patterns from these particles matched those obtained from the platy particles with which they were asso ciated and in no way resembled the typical amphibole diffrac tion pattern obtained from single amphibole asbestos fibres. Other fibrous particles were observed in the mainly talc specimens which to some extent resembled chrysotile asbestos fibres rather than amphibole minerals. They often had a somewhat textile appearance but were, however, crystalline. Diffraction patterns from these fibres v/ere very distorted and in no way matched typical chrysotile or amphibole patterns. J&J-0060696 FITZGERALD00080 The only group of specimens in which, amphibole fibres sere confirmed were in those specimens with known amphibole composition. However, even the fibres found in these speci mens barely resembled the fibres formed by the commercial amphibole asbestos minerals. To assess the particles produced from the pure amphibole mineral (TremoliteJ,found in three of the specimens, small crystals of the mineral were taken from the hand specimens and crushed separately. An examination of the-finer particles produced revealed stubby electron dense fibres associated with Irregular-lumps of the same mineral. . Diffraction patterns from these fibres were similar to those obtained from the commercial amphibole minerals, although they were more difficult to obtain because of the greater thickness of these particles. Other specimens in the group, which did not contain talc but were composed of sheet silicate minerals mainly muscovite, Were also practically free of fibrous parti cles. There appeared to be no general tendency for these other minerals to form fine fibrous particles. A number of very fine short fibres were observed on grids prepared from several of the talc specimens, these were, however, chance small pieces torn from the edges of. talc plates. They appeared in those samples which had a tendency to form copius numbers of very fine particles when subjected to comminution. The specimens examined can be grouped into four categories on the basis of particle morphology and they are as follows: (a) Talc specimens with impurities of carbonate and chlorite. (bj Rock type specimens, i.e. footwall limestone etc. Cc) Those specimens composed mainly of carbonates. Cd} Amphibole specimens with carbonate and talc. The talc specimens were characterised by the large number of plate like particles often translucent in the electron beam. Rock specimens varied from specimens which were composed mainly of compact electron dense particles to those with some sheet silicate content in which plate like particles become apparent. Those specimens composed mainly of carbonate material produced compact rounded particles, often, very small and grouped to gether in aggregates. Finally the specimens containing amphi bole were characterised by the compact nature of the particles w i t h evenly distributed fibres and very few translucent plates. The groups of particles described are illustrated by the fall owing micrographs which illustrate the various forms. Selected area electron diffraction patterns obtained from single particles of the amphibole mineral are also presented showing the similarity of these patterns to those obtained from commercial asbestos fibres. Also included are single crystals patterns and polycrystalline patterns, from talc, chlorite and muscovite rich specimens. It can be seen that they are very different in character to those obtained from the amphibole mineral. However, patterns from the sheet silicate minerals mentioned above are all very similar and it is impossible to identify each of these minerals from their J&J-0060697 FITZGERALD00081 55 electron diffraction patterns or to tell them apart without applying a more sophisticated approach to the diffraction procedure. With specimen tilt facilities enabling the particle to he rotated, through more than 45 discrimination is possible between certain of, these minerals. As mentioned earlier, patterns obtained from lath like particles found in the talc specimens were identical to those observed from general plate like forms. Those fibres with a textile like appearance often only gave very streaked patterns but in one or two cases these also resembled very closely the normal talc pattern* J&J-0060698 FITZGERALD00082 56 Examples of Commercial Amphibole' and Chrysotile asbestos particles together with typical selected area electron diffraction patterns. - Anthophyllito asbestos particles x 3000 J&J-0060699 FITZGERALD00083 Amosite asbestos particles x 3000 Crocidolite asbestos particles x 3000 J&J-0060700 FITZGERALD00084 58 amphibole asbestos selected area electron diffraction pattern* Chrysotie asbestos selected area electron, diffraction pattern.- J&J-0060701 FITZGERALD00085 Electron micrographs of particles produced from specimens which, have been classified as rocls. types. \ 4 J&J-0060702 FITZGERALD00086 60 Fig. 1 Specimen 113 seam inclusion showing passage into talc x 3000. The particles are mainly compact and electron dense, A few flakes, no fibres present II- Jf'-T. (T S /\ '^ r t i f 1./^ V j - l C ' l 4^;-/a* (< *4 r\s=y. V * - v - `- &&_ w . t'g) fi*> v-v v jW V v . w T i / ' " - . i ;4 V *>r., ^ V **,. / * . * 4 %t 'X v Sir &. * * ? _ % %* jrfk, ' % # Fig. 2 * Specimen I1 5 . Talc footwall contact.- x 3000. Compact particles with a few small flakes* Eo fibres present. J&J-0060703 FITZGERALD00087 If ^ S> P v f %/*-' . *,* \ /- ; vv; J ,0^T-\ . r V *:v V * J ? .- \ ^ ..V - , 1 v vr " </: ->\,,. - *,'Ni "'4'/yv flw , jp>W4+' V .~S. Fig<> 3 Specimen lie. Lithological inclusion from - Face 1. x 3000. Compact electron dense psfrticles. No fibres present Specimen 1x7* Foatwali rock, sample, ,x 3000* Mainly compact particles produced with, a few plate like forms. J&J-0060704 FITZGERALD00088 62 Fig- 5 ,, Specimen 1234 Black gneiss, 2ft below talc seam x 3000. Compact electron dense * particles produced. Fig. 6 Specimen 125. Footwall limestone, x 3000. Compact electron dense particles.- J&J-0060705 FITZGERALD00089 63 Fig- 7 b Specimen 127- Lithological inclusion face 1. x 3000. Platey electron dense particles. No fibres. K T 3 1 r ' - -- r r ? /-- ;a 3 - } Cw.v \ v V %c >-Vi' . ,/> ,,V-i X - /- , :.v J f \ t -- * > t SSak.jA \v. v 1 J<7> f |: V*, ` vsr > > i \ >/ i.J l v /\i X' . Ato > c. a -v- / bf 1. xj--*y I .J >',-1> f^e4T.N.*i;\*- ^ u vxy/TX -K n >/ a ** * >- ' t*%. " A ~- -! A A-- , J ..-jc? 6,. i-lrij--k a Fig. 8 . Specimen 129- Sample 6 Footvall. x 3000 Compact electron dense particles with a few Dlate-like forms * J&J-0060706 FITZGERALD00090 64 Fig . o Specimen 131 Black inclusion.face 1 x 3000 A mixture of plate-like and compact forms mainly electron dense in character. - - j. J V,X r^ r;.rT/ /K - *' 'fij v'&v'l * 1 # o'* - *j-< y -- ` m \ v\ '^j*1"~1*,V i -a * / vtr'f* ^ A --w t i -H/ * * ;rWJ f VC.a ^ .%`V < ssr^^ '-`-''W i ' \ > * ? / - < , ^J . Specimen I3 4 . Marble from tunnel wall, x 3000 Mainly compact electron dense particles with a few plate-like forms. J&J-0060707 FITZGERALD00091 65 Electron micrographs of particles produced from those specimens mainly composed of carbonate minerals* J&J-0060708 FITZGERALD00092 66 Fig. 1 Specimen X U . Carbonate inclusion with some t talc, x 3000. Particles consist of a mixture of compact and plate-like forms. I ***\ ^ * -* < r ^ Pig. 2 . Specimen I1 4 . Inclusion in talc seam Face 4 r middle of seam, x 3000. Granular particles with, plate-like types and lath-like forms. J&J-Q060709 FITZGERALD00093 67 Pig 3 . Specimen 1^8. Carbonate/talc sample, x 3000, Particles compact and electron dense* A few plate-like forms. ZSi-* Specimen I2 1 * Inclusion from Face 2. .x 3000. This specimen produced plate-like and compact particles with some lath-like forma. J&J-0060710 FITZGERALD00094 68 Fig 5 Specimen I3 5 * Massive carbonate from rear end of working, x 3000* Compact electron dense particles with, some plate-like talc particles * STTrO a r'"s: - L-;- - - , L - r . V.-V l.' -r-" n/ . / T 1"* ..y y^v -"l V|>C '>*.< V V! I *> n 1 .a?. ' v-V**' t ^ ^ d K i v t r r / W it (?0 Fig. . - . <2. jUi** -a ... I Specimen I3 7 . Carbonate in talc inclusion x 3000. Compact particles together with some plate-like forms and rolled talc sheets J&J-0060711 FITZGERALD00095 69 Electron Micrographs of specimens of talc Kith carbonate and other mineral inclusions,. J&J-0060712 FITZGERALD00096 Ficr. 1 - Specimen 1 3 . Coloured talc (Green) x 3000. Particles plate-like. Few fibres, rolled sheets and sherds. Fie. 2 . Specimen 1 5 . General ore, x 3000. Plate-l'ike particles together with, short lath-like particles, also a typical example of textile type fibre. J&J-0060713 FITZGERALD00097 Fig. 3 Specimen 18* Massive talc, x 3000* Plate like particles with, a few lath.- forms also typical textile type long fibre. F i g . 4. Specimen 1 9 . Grey talc First Face, x 3000. 1''" Practic ally all plate-like with a few lath forms. J&J-0060714 FITZGERALD00098 t 4. Fig. 5 Specimen Igo* Granular talc, x 3000 All plate-like particles. Fig, 6. Specimen 124- Talc next to carbonate inclusion, x 3000. This specimen V7as found to contain a large tnirnher of lath-like particles, as can be seen from the micrograph, above. Me diffraction pattern corresponding with an amphibole fibre was obtained from a selection of .the elongated particles. J&J-00S0715 FITZGERALD00099 Fig* 7 Specimen 126* Coloured talc inclusions, x 3000. The particles produced from the various coloured inclusions in the talc were found to be mainly plate-like with a few lath forms. Fid 8 . Specimen 128* Talc/Quartz specimen, x 3000. Particles from this specimen were mainly plate like but accompanied by more compact opaque particles. A few textile type fibres were observed. J&J-0060716 F IT Z G E R A L D 0 0 1 00 74 Fig* 9o Specimen I 3 2 * Face 2 inclusion from base of talc seam, x 3000. The specimen produced a mixture of irregular particles, varying from compact to plate-like in form with a few lath, like particles. Flcr.10 Specimen I3 3 . Talc from lower left end of working 35 3000. Particles mainly plate-like with soma lath forms. J&J-0060717 F IT Z G E R A L D 0 0 1 01 'F t c f v :11 Specimen I3 8 . Pyrite/Talc specimen, x 3000, Plate-like particles with, some rolled tubes of talc. Fig. 1 2 . Specimen 139 5" - 0 coloured pieces from the crusher, x 3000. These various coloured talc pieces produced only plate-like particles. J&J-0060718 F IT Z G E R A L D 0 0 1 02 Flcu 13 Specimen 141* Face 2, good talc specir Plate-like particles together with roll sheets lath forms and textile type fib* ; V I . , A .;. . ^ i' : ^ -'A / fV* f .0 / \Vv T t; , , v * . `- r ^ v*>.i** M- : \ o: ``S' V. -- ' v Y'"v (r; V *.* tv H {f Flor 14. Specimen 142* Face 1, green coloured This cploured specimen produced plat eles which were rather more electron de: J&J-0060719 F IT Z G E R A L D 0 0 1 03 Fig 15. Specimen 143 Face 10 Fibrous looking band specimen r x 3000 This sample was found to be practically all plate-like in form < Fig. 16. Specimen I4 4 . Face 1. Pure talc sample, x3000. Plate-like particles with some lath-like forms. J&J-0060720 FITZGERALD00104 78 ' Pity 17 Specimen 14S- Face 1. Good talc specimen, x 3000. K mixture of plate-like particles and fibrous forms, including rolled tubes and textile type fibres. Fig. 18 Specimen l4 fj. Face 3. Coloured specimen x 3000. Plate-like particles with shards and lath like forms, together with a typical textile form, which can be seen to have a sheet-like form* J&J-0060721 F IT Z G E R A L D 0 0 1 05 79 Electron. Micrographs of particles produced from those specimens containing amphibole mineral and also from the amphibole mineral itself. i J&J-0060722 F IT Z G E R A L D 0 0 1 06 Fig, 1 Specimen 119. Trentolite/carbonate talc sample x 3000. Compact particles ra few lath, forms present F i g . 2 . Specimen 120. Araphibole sample from Guiana level 1212. x 3000. Compact particles with numerous lath forms. J&J-0060723 F IT Z G E R A L D 0 0 1 07 Figs, 3 and 4 Particles produced from single crystals of tremolite extracted from specimens I1 9 and *20 x 3000. Very few fibrous particles were produced when this specimen was crushed. Those that were fibrous in nature were thick and stubby in character, less than 50% of the particles were elongated in shape. J&J-0060724 F IT Z G E R A L D 0 0 1 08 82 Pigs* 5- and 6 ' Selected area electron diffraction patterns obtained from anphibole particles found in specimens 1 1 9 and 1 2 0 J&J-0060725 F IT Z G E R A L D 0 0 1 09 83 Fig o 7 6 Typical selected area diffraction pattern obtained from talc plates. t Fig. 8 . Selected area diffraction pattern obtained from a typical textile type fibre shoving features of a rotated or coiled structure. J&J-0060726 F IT Z G E R A L D 0 0 1 10 84 X-RAY ANALYSIS OF ITALIAN MINE SAMPLES Introduction This report concerns the -X-ray powder analysis of the Italian mine samples. The samples were classified into three categories according to their chemical and physical properties: t U 'Rock* Type Cii) 'Talc' Type {ill} 'Carbonate* Type All the samples were prepared by similar means and the procedure for obtaining the X-ray powder patterns was standardised. From these powder photographs , several were chosen which clearly showed distinct mineral phases. These were used as standards for this group of samples. These standard patterns were compared against the ASTM index and this comparison illustrates the need to prepare standards for a particular locality from specimens at that locality. The samples were compared with these standards by com puter methods and visually and the results and discrepancies between the methods of comparison noted. LIST OF SAMPLES See Table 1 SAMPLE PREPARATION The samples were received mainly as large rocks and were labelled according to their appearance and location in the mire. With, the larger samples a section was cut from the middle to be a representative sample, for the smaller samples as many pieces as possible were crushed to form the represen tative sample. These samples were then roughly broken up and placed in a *Tema* disc mill and ground for 5 mins, until all the sample was below approx. 100 mesh. These powders were stored in clean plastic bags. The samples, when required for X-ray analysis, were further ground (to less than 300 mesh} in a-small agate ball mill and then sieved through, a 350 mesh screen tand stored in plastic bags* The grinding Mills and other apparatus used were thorough ly cleaned between samples and during the grinding care was taken to obtain a good representative sample. J&J-0060727 F IT Z G E R A L D 0 0 1 11 All the samples were analysed using a Debye-Scherrer camera mounted on a Raymax RX 3-D X-ray generator. A copper X-ray tube was used with nickel filters (0.02 mm thick! and the power rating of the tube set at 36 kV and 22mA. The apparatus was carefully aligned and checked before mounting a sample. All the samples had the same exposure time of 8 hrs. The samples were loaded into 0.5 mm diameter Lindemann glass tubes to be mounted in the Debye-Scherrer cameras. In. the cameras Ilford Industrial *G* X-ray film was used. The film was processed using Kodak DX-80 developer and Ilford Hypain fixer* The films were developed for 5 minutes using a 1:4 dilution for the developer and fixed for 2 minutes. The films were then washed in running water for 30 minutes and allowed to dry naturally. The X-ray films were then measured. Using an illuminated screen and .the line-spacings calculated, taking into account film shrinkage, from these line spacings the bragg angle and *d* spacings can be calcu lated. STANDARD PATTERNS When all the samples X-ray photographs had been measured and the *d* spacings calculated, they were visually inspected to find the film showing samples with pure mineral phases. These patterns were then taken as standards* The samples were then broken up and the different mineral phases were sorted by hand to attempt to find a purer standard. These samples were then crushed in a similar way to the samples crushed beforehand. For X-ray analysis they were placed in 0 . 2 m m diameter tubes and given a 12 hr exposure. This method was used to give finer lines on the X-ray photograph and the larger exposure was to try and detect as many impurities as possible. The *d* spacings of the standards were compared with the A.S.T.M. index and also with themselves. They were compared with themselves to check that all the Talc and Chlorite standards matched each other and were similar in intensity. Several standards were prepared containing the same mineral. This was because the *d* spacings of the mineral varied slightly from sample to sample and especially with chlorite, depending on its composition the major reflections varied between 13.5% and 15.0%. This was mainly due to varying iron content and this can easily be seen on the X-ray films as it, causes fluorescence with copper radiation and blackens the X-ray film generally. J&J-0060728 F IT Z G E R A L D 0 0 1 12 86 RESULTS For the analysis of the results the samples have been divided into five sections: Ci) standard patterns (ill sample patterns Crack type) (iiil sample patterns Ccarbonate type}. Civ) sample patterns (talc type) tv) batch sample patterns (includes old powders and shipments). Two methods were used to find the mineral present in the sample. One method uses a computer program to detect the mineral. In this method the bragg angles of samples were compared w i t h the bragg angles of the standard and the number of lines fitted printed out. A print out was also obtained of all the standards which fitted a particular line to find all the possible minerals present and to see which lines were common to several standards. As this procedure is quite long* the lines in the sample Were first sorted into order of decreasing intensity and then the three most intense lines of the sample compared with the standards. If all three lines failed to match, it was consid ered that that standard was not present and so the program deleted that standard from the comparison. At the end of the program the list of the standards was printed with the percentage of lines fitted to the sample noted. The obvious disadvantage of this comparison was that the program c o u ld take no account of the relative intensities of the lines and so a visual method was used to find which was the major mineral phase. The computer program usually found the mineral phases present in the samples but could not place them in the correct order* t J&J-0060729 F IT Z G E R A L D 0 0 1 13 Patterns used as standards from the Italian mine samples and their comparison with A.ST.M,, data and against themselves* J&J-0060730 FIT Z G ER A LD 0 0 1 1 4 --jr Comparison aaainst A.S.T.M,,- indext 1 line unmatched, 1.1.145 , -Patterns not Included: 6-263 Muscovite -2M1, 7-25 i Muscovite (1M), 7-32 Muscovite (2M1), 7-76 Ripidolite (Chlorite), 7-78 Thuringite (Chlorite), 7-166 Bavalite (Chlorite), 10-133 Peninnite Chlorite , 11-78 Dolomite, II B and T Quartz.. iMost probable minerals presentt Talc Muscovite Calcite I Comparison against Italian Standards ` Patterns not includedt Chlorite (142), Chlorite (14), Muscovite (135), Magnesite (16), Tremolite (119/120), Dolomit .Most probable Minerals present: Talc Visual comparison Talc, Calcite Minerals detected Talc, Calcite SAMPLE SXP 2 TALC ||; ?i ; y-' ' '? _ i i :.l of. ;i Comparison aaainst A.S.T.M. index 2 lines unmatched, 1.1159. l ' 1 7 35 3g-------- ----------- :---- l Patterns not included: 7-76 Ripodolite (Chlorite), \ ' 7 - 7 Thuringite (Chlorite), 7-166 Bavalite (Chlorite). Most probable minerals present; Talc, Muscovite, Calcite Comparison against Italian Standards t Patterns not included: Chlorite (142), Chlorite (14), 1 - Tremolite (119/120}. Most probable minerals present: Talc, Muscovite, Magnesite. Visual Comparison ' Talc, Chlorite, Magnesite 'Minerals Detected Talc, ChloriteV'Mag'nestie J&J-0060731 F IT Z G E R A L D 0 0 1 15 SAMPLE SIP 3 CHLORITE Comparison against A.S.T.M. index: 2 lines unmatched, 1.1739&, o 1.29A Patterns not included; 6-263 Muscovite -2M1, 7-25 Muscovite (IM) 7-32 Muscovite (2M1), 7-79 Forsterxte (Olivine), 8-479 Magnesite Most probable minerals present; Chlorite, Talc Comparison against Italian Standards Patterns not included: Muscovite (X35), Tremolite (119 and 120) Most probable minerals present? Chlorite, Talc. Visual Comparison Chlorite, Talc Minerals Present . ,Chlorite / Talc - SAMPLE SIP 4 CHLORITE Comparison against A.S.T.M. index: 3 lines unmatched l*1741Atf 1.1318A, 1.0984?. Patterns not included; 6-263 Muscovite -2M1, 7-32 Muscovite (2M1), 8-479 Magnesite, 11-78 Dolomite# 13-437 Boric Acid. Most probable minerals present;- Chlorite, Talc \ Comparison against Italian Standards Patterns not included: Calcite (134), Magnesite (137)# Muscovite (135), Tremolite (119/120), Dolomite. Most probable mineral present; Chlorite, Talc Visual Comparison 1 Chlorite, Talc v. Minerals Present Chlorite, Talc J&J-0060732 F IT Z G E R A L D 0 0 1 16 Comparison against' ft.ff.T.M. index t Patterns not included; 5-586 Calcite, 7-25 Muscovite (IM), 7-77 Sheridanite (Chlorite)/ 7-79 Fotsterite'(Olivine), 7-166 Bavalite (Chlorite), Most probable minerals present: .Talc, Muscovite, Chlorite Comparison against Italian Standards ~ Patterns not included; Chlorite (142), Chlorite (14), Magnesite(16>, Tremolite (I19/120),, Most probable minerals present? Talc Visual comparison Talc, Chlorite - Minerals Present Talc, Chlorite SAMPLE SIP 6 MOSCOVITE Patterns not included; 3-881 Talc, 7-79 Forsterite (Olivine), 7- 166 Bavalite (Chlorite), 7-183 Penninite (CHlorite), 8- 479 Magnesite, 11-78 Dolomite, 19-770 Talc. Most'probable minerals present: Muscovite, Chlorite Comparison against Italian Standards Patterns not included; Magnesite (137), Tremolite (119 and 120) . Dolomite Most probable minerals present: Muscovite, Talc \ Visual Comparison Mineral Present Muscovite, Calcite Muscovite, Calcite J&J-0060733 F IT Z G E R A L D 0 0 1 17 SAMPLE SIP 7 MAGNESITE Comparison against A.S.T.M, Index Patterns not includedt 5-586 Calcite, 6-263 Muscovite -2M1, 7-25 Muscovite CXI-il , 7-32 Muscovite (2M1), 7-160 Chlorite (Kotshuheite), 7-76 Ripodolite (Chlorite), 7-78 Thuringite (Chlorite), 7-166 Bavalite (Chlorite), 10-183 Penninite Chlorite, 13-437 Tremolite. % Most probable minerals present* Magnesite, Dolomite, Talc Comparison against Italian Standards Patterns not included; Calcite (134), Chlorite (14) Muscovite (135), Tremolite (119/120)* Most probable' minerals present; Magnesite, Dolomite, Talc Visual Comparison Magnesite, Talc Minerals Present Talc, Magnesite, SAMPLE SIP 8 TREMOLITE Patterns not Included: 6-263 Muscovite -2M1, 7-25 Muscovite (IM), 7-32 Muscovite (2M1), 7--42 Muscovite (3T), 7-79 Forster ite (Olivine) . Most probable minerals present: Tremolite, Talc, Calcite Comparison against Italian Standards Patterns not included: Magnesite (137), Chlorite (14), Muscovite (135). Most probable minerals present; Tremolite, Talc, Calcito Visual Comparison" Tremolite, Talc - Minerals Present Tremolite, Talc J&J-0060734 F IT Z G E R A L D 0 0 1 18 -K-vifiio a i F ^ DOLOMITE Patterns not included: 3-881 Talc, 6-283 Muscovite -2M1, 7-25 Muscovite (IM), 7-32 Muscovite (2M1) , 13-814 Muscovite 2M1 (Vanadian) , 7-160 Chlorite (Kotschubeite), 7-79 Forsteritfe (Olivine), 13-437 Tremolite, 19-770 Talc* Most probable minerals present; Dolomite, Muscovite Comparison against Italian Standards Patterns not included; Magnesite (X37), Chlorite (14) Tremolite (119/120) * Most probable minerals presents Dolomite, Talc Visual Comparison . ' Dolomite, Muscovite, Calcite Minerals Present Dolomite, Muscovite, Calcit SAMPLE SIP 10 CALCITS Patterns not includeds 7-160 Chlorite (Kotschubeite), 7-79 Forsterite. (Olivine), 13-437 Tremolite. Most probable mineris present: Calcite, Muscovite Comparison against Italian Standards ,Patterns not included; Magnesite (16), Tremolite (119-120) 0 Most probable minerals present: Calcite, Muscovite Visual Comparison Calcite , Minerals .Present .~Calcite, Muscovite J& J-0060735 FITZGERALD00119 93 SAMPLE SIP II MAGNESITS o Comparison against A.S.T.M. Index; 1 Unmatched line 1,1085a .Patterns not included: 5-586 Calotte* 7-25 Muscovite (IM)* . 7-160 Chlorite (Kotschubeite) , 7--76 Ripidolite (Chlorite)* 7-78 Thuringite (Chlorite), 7-166 Bavalite (Chlorite), 10-183 Penninite Chlorite, B & T Quartz, Most probable minerals present: Magnesite, Dolomite, Talc ,Comparison against the Italian Standards Patterns not included; Calcite (134) , Chlorite (14) , Muscovite (1351. Most probable minerals present; Magnesite, Dolomite, Talc Visual Comparison Magnesite, Dolomite, Talc Minerals Present Magnesite* Talc, Dolomite i J&J-D060736 FITZGERALD00120 94 Examples of Patterns Obtained from Rock Type Specimens and Their Major Mineral Content from X-Ray Comparison. t J&J-0060737 FITZGERALD00121 -! . . | -I- ; ' |j ; i I iIi X' i ji"j !{ : ; . ;| i I! .i i; .! SAMPLE XI 'TALC PROM POQTW&LL CONTACT Comparison Patterns not included: Magnesite (.137), Tremollte (119/120). Most probable minerals present: Chlorite, Muscovite, Talc, - . . Dolomite. Visual Comparison; Talc Chlorite, Calcite Minerals Present; 'Talc Chlorite, Calcite. ' - . SAMPLE 17 MICA SCHIST 4----------------------- 'Comparison 'Patterns not included; Magnesite (137), Talc (146), Tremollte (119/120)* Most probable minerals present: Muscovite, Talc, Quartz 'Visual Comparison: Muscovite, Talc,Quartz Minerals Present: SAMPLE 112 FQQTWALL SAMPLE? AMPHIBOLITE o oo Comparison: 3 lines unmatched. 6.4653A 1.2819A 1.225A Patterns not included; Calcite (134), Magnesite (137), Talc (146), Talc (IS), Tremollte (119/120) . Most probable minerals present: Muscovite, Dolomite, Quartz. 'Visual' Comparison: Muscovite, Chlorite, Quartz 'Minerals Present: | I ii i J&J-0060738 F IT Z G E R A L D 0 0 1 22 SAMPLE 113 INCLUSION SHOTO1G PASSAGE INTO TALC &QTTQM TRANSIT Tremolite (119/120) , Dolomite Most probable minerals present; Chlorite, Talc, Quartz Visual Comparison; Chlorite, Muscovite, Quartz Minerals Presenti Chlorite, Muscovite, quartz SAMPLE 115 TALC-FOOTWALL CONTACT Comparison; Patterns not included: Magnesite (137), Tremolite (119/I20) Most probable minerals present; Chlorite, Talc, Muscovite, Quartz. Visual Comparison: Chlorite, Talc, Quartz Minerals Present; Chlorite, Talc, Quart2 J&J-0060739 F IT Z G E R A L D 0 0 1 23 97 SAMPLE 116 FACE 1 INCLUSION BELOW SEAM Comparison Patterns not included t Talc tI45) , Tremolite (.119/1201 Dolomite Most probable minerals present: Muscovite, Chlorite, Calcite, Quartz . Visual Comparison: Chlorite, Muscovite, Calcite, Quartz Minerals present? Chlorite, Muscovite, Calcite, Quartz . SAMPLE 117 FOOTWALL ROCK SAMPLE Comparison; 2 unmatched lines oo 6.6957A, 1.6305A Patterns not included: Talc (146), Chlorite (X42), Muscovite (135), Magnesite (16), Tremolite (119/120), Dolomite. Most probable minerals present; Calcite, Talc, Quartz Visual Comparison; Calcite, Talc, Quartz Minerals Presents Calcite, Talc, Quartz . . i J&J-0060740 F IT Z G E R A L D 0 0 1 24 SAMPLE 120 AMPHIBOLE SAMPLE FROM GUIANA LEVEL 1212 Comparison? 1 unmatched line O 1.6309A Patterns not included: Chlorite (142), Chlorite (14), Muscovite (135), Magnesite (16)r Dolomite. Most probable minerals present? Talc, TrentoLite, Calcite, Magnesite. Visual Comparison; Talc, Tremolite, Chlorite Minerals Present: Talc, Chlorite, Tremolite SAMPLE 123 SLACK GNEISS Patterns not included; Calcite (134), Tremolite (119/120) Most probable minerals present: Muscovite, Talc, Magnesite, Quartz Visual Comparison: Muscovite, Magnesite, Quartz Minerals Present: Muscovite, Magnesite, Quart2 i K J&J-0060741 F IT Z G E R A L D 0 0 1 25 99 SAMPLE 125 LIMESTONE FOOTVE&LL Comparison Patterns not Included: Calcite (134), Tremoiite (119/120) Most probable minerals present; `Pale, Chlorite, Quartz Visual Comparison: Talc Magnesite, Quartz ' Minerals Present; Talc, Magnesite, Quartz ` ' SAMPLE X27 LITHOLOGICAL INCLUSION Comparison Patterns not included: Chlorite (142), Chlorite (14) , Tremoiite (119/120), Magnesite (16), Dolomite Most probable minerals present: Talc, Calcite, Quartz . Visual Comparison: Talc, Calcite, Quartz Minerals Present; Talc, Calcite, Quartz ' SAMPLE 129 SAMPLE 6 FOOTWALL Comparisons 2 unmatched lines oo 1.1526A, 6.3031A Patterns not included: Calcite CI34), Magnesite (137), Chlorite CI4), Talc CIS). Most probable minerals present? Muscovite, Quartz, Dolomite, Talc Visual Comparison: Muscovite, Quartz Minerals Present: 'Muscovite, Quartz J&J-0060742 F IT Z G E R A L D 0 0 1 26 SAMPLE 13I BLACK INCLUSION *Comparison; 1 unmatched line O 1*2145A 'Patterns not included; Magnesite (137), Talc :{I5),Dolomite 'Most' probable minerals present: ' Muscovite, Calcite, Talc 'Visual-'Comparison? 'Muscovite* Calcite `Minerals Present: Muscovite, Calcite SAMPLE 134 TUNNEL WALL - MARBLE Comparison Patterns not included; Tremolite (119/120), Magnesite (16) Most probable minerals present: Calcite, Muscovite, TalcVisual Comparison, Calcite Minerals Present Calcite i # J&J-0060743 F IT Z G E R A L D 0 0 1 27 101 Examples of Patterns Obtained from the Carbonate Specimens and their Major Mineral Compo sition Obtained from Comparison triLth Standards. t J&J-0060744 F IT Z G E R A L D 0 0 1 28 102 SAMPLE 14 FACE 10 AMPHIBOLE O Oo Comparison; 3 unmatched lines 1,2586a , 1.0823A, 1,Q74A ' Patterns not included: Chlorite (142) r Chlorite (14) Dolomite Most probable minerals present: Tremolite, T a l c , Magnesite 'Visual Comparison! Talc, Tremolite, Magnesite Minerals Present: Talc, Tremolite, Magnesite SAMPLE 16 QUARTZ Comparison Patterns not included: Calcite (134), Chlorite (14) Tremolite (I13/L20) Most probable minerals present; Magnesite, Dolomite, Talc Visual Comparison; MAGNESITE, Talc Minerals Present; Magnesite, Talc i 4 J&J-0060745 F I T Z G E R A L D 0 0 1 29 103 SAMPLE 111 CARBONATE - TALC INCLUSION -- -- t ? W V-* Comparison; 1 unmatched line -A a m . H i-1 'Sf i s j f i & l iitaaw; isia.i-'U; It.A-jj 1 2143A Patterns not included; Chlorite (142), Chlorite (14) ' Most probable minerals present; Magnesite, Dolomite, Talc Visual Comparison; Talc, Magnesite, Calcite 'Minerals Present: Talc, Magnesite, Calcite SAMPLE 114 SEAM 4 INCLUSION IN TALC Comparison `Patterns not included: Magnesite Muscovite (137), Chlorite (14), (135), Tremolite(119/120) Most probable minerals present; Dolomite, Talc 'Visual Comparison; Talc, Dolomite Minerals Present; Talc, Dolomite SAMPLE 118 FACE 3 MAGNESITE AND TALC Comparison: Patterns not included; Talc ( 1 5 ) Tremolite (119/120) Most probable minerals present: Dolomite, Magnesite, Chlorite Visual Comparison; Dolomite, Talc Chlorite Minerals Present: Dolomite, Talc, Chlorite. J&J-0D60746 F IT Z G E R A L D 0 0 1 30 104 SAMPLE I 19 IMPURITY IN TALC AND QUARTZ Comparison: Patterns not included: Magnesite (.137} Most probable minerals present? Tremollte, Dolomite, Muscovite, Talc Visual Comparison: Talc, Tremollte, Magnesite, Minerals Presents Talc, Tremollte, Magnesite SAMPLE 121 FACE 2 OCCLUSION (MAGNESITE) (r* _ n- Jc _ t \ ;Y; 1 \ Y- \ ' ' ' Viioit,:, y.i-, -A% "` ? " -. ?}i ><j h\ it.'VA .:v v - i `Comparison: Patterns not included; Calcite (134), Chlorite (14), Muscovite (135), Tremlite (119/120) Most probable minerals present; Dolomite. Magnesite, Talc Visual Comparison:* -Talc, Magnesite, Dolomite % Minerals Present: Talc, Magnesite, Dolomite J&J-0060747 F IT Z G E R A L D 0 0 1 31 105 SAMPLE 122 MAGNESITE, DOLOMITE, TALC Comparison t Patterns not included: Calcite (134}, Talc (145), Talc (146) Muscovite (135}, Tremolite (119/120), Most probable minerals present; Dolomite, Magnesite, Chlorite, Talc. Visual Comparison; Talc, Dolomite. Minerals Presentt Talc, Dolomite SAMPLE 130 TALC AND OTHERS Comparison r Patterns not included: Magnesite (137), Talc (15), ' Tremolite (119/120}. Most probable minerals presents Dolomite, Chlorite, Muscovite, Talc, Visual Comparisont Talc, Chlorite i Minerals Present: ^ Talc, Chlorite J&J-0060748 F IT Z G E R A L D 0 0 1 32 106 SAMPLE 135 MASSIVE CARBONATE END OF WORKING Comparison.? ` Patterns not included; Tremolite (119/120) 'MOsf probable minerals presents Muscovite, Magnesite, ----- ------------------------- Chlorite Visual Comparison: Magnesite, Talc, Chlorite Minerals Presents Magnesite, Talc, Chlorite SAMPLE 137 CARBONATE AND TALC Comparison Patterns not included: Calcite (134), Chlorite (14), Muscovite (135). Most probable minerals present? Magnesite Dolomite, Talc Visual Comparison: Magnesite, Talc Mine.? is Present? 1 Magnesite, Talc J&J-060749 FITZGERALD00133 107 Examples of Patterns and Major Mineral Content of Those Specimens Classified as Talc Types Obtained by Comparison0 J&J-0060750 FITZGERALD00134 108 SAMPLE 12 SORTING PIECES - Comparison Patterns not includedz Tremolite (119/120). Most probable minerals present; Chlorite, Magnesiter Talc Visual Comparison: Chlorite. Talc Minerals Present? Chlorite, Talc SAMPLE 13 COLOURED TALC Comparison i Patterns not included: Chlorite (142), Chlorite (14}, Muscovite (135}f Magnesite (16), Tremolite (119/120), Dolomite Most probable minerals present: Talc Visual Comparisons l Minerals present? Talc Talc J&J-0060751 FITZGERALD00135 109 SAMPLE 15 GENERAL ORE Patterns not included; Chlorite (142), Chlorite (14), Muscovite (135), Dolomite. Most probable minerals present: Talc, Magnesite Visual Comparison? Talc Minerals present; Talc SAMPLE 18 MASSIVE TALC Comparison Patterns not Included; Magnesite (16)/ Tremolite (119/120). Most probable minerals present; Talc, Chlorite Visual Comparison: i Minerals Present? v .Talc, Chlorite Talc, Chlorite J&J-0069752 F IT Z G E R A L D 0 0 1 36 110 SAMPLE 19 FACE 1 GREY TALC Comparison Patterns not includedi Calcite (134), Magnesite (137), Muscovite (135), Magnesite (15), Tremolite (119/120),* Most probable minerals present; Ta l c ,, Chlorite . Visible Comparison: Talc, Chlorite Minerals Present? Talc, Chlorite SAMPLE IIP GRANULAR TALC Comparison Patterns not included: Calcite (134), Magnesite (137), Chlorite (142) Chlorite (14) , Muscovite (135), Magnesite (16) Tremolite (119/120) Most probable minerals present: Talc, Dolomite Visible Comparisons Talc, Dolomite Minerals Presents Talc, Dolomite t J&J-0060753 F IT Z G E R A L D 0 0 1 37 Ill SAMPLE 124 TALC FACE 2 Patterns not included; Muscovite (135), Tremolite (119/120) Magnesite (16}* Most probable minerals present! Talc, Chlorite, Dolomite, Magnesite Visual Comparison: 'Dolomite. Magnesite, Talc Minerals Present: Dolomite, Magnesite# Talc SAMPLE 126 TALC INCLUSIONS Comparison Patterns not included! Calcite (134), Tremolite (119/120) Most "probable minerals presentr Talc, Chlorite, Dolomite Visual Comparison: Talc, Chlorite Minerals present; 1 Talc, Chlorite J&J-0060754 F IT Z G E R A L D 0 0 1 38 112 SAMPLE 128 QUARTZ TALC Comparison Patterns not included; Muscovite (135), Tremolite (I19/T20) Magnesite (16)r Dolomite Most probable minerals present: Chlorite Talc# Quartz Visual Comparison? Chlorite, Talc#Quartz 'Minerals Present; Chlorite, Talc, Quartz : SAMPLE 132 OCCLUSTON FACE 2 . l : -> ::. . . ; . t; j l i f i f . . : j , r> : - - .<> * !;i ;; :a Patterns not Included: Muscovite (135)r Tremolite (I19/I20J Dolomite Most probable minerals present; Chlorite, Talc, Magnesite Visual Comparison; Minerals Present? Chlorite, Talc Chlorite, Talc J&J-0060755 F IT Z G E R A L D 0 0 1 39 113 SAMPLE 133 TALC END OP STORKING Comparison; Patterns not included; Muscovite (135), Tremolite (119/120) Most probable minerals present: Talc, Chlorite, Magnesite Dolomite Visual Comparison: Talc, Chlorite, Magnesite "Minerals Present Talc, Chlorite, Magnesite SAMPLE 136 GREY TALC Comparison; 2 unmatched lines oo 1.2204A* 1.1517A Patterns not included: Calcite (134),, Talc (146) Tremolite (119/120) Most probable minerals present; Chlorite.- Muscovite, Talc Visual Comparison: Chlorite, Talc Minerals Present; Chlorite, Talc SAMPLE 138 TALC AND PYRITE Comparison: 1 unmatched line O 1.041A Patterns not included: Chlorite (142), Chlorite (14),. Muscovite (135), Tremolite (119/120) Most probable minerals present: Talc, Calcite Visual Cor.oarison: * Talc, Calcite Minerals Present: Talc, Calcite J&J-0060756 FITZGERALD00140 SAMPLE 139 S-^Q1 FROM CRUSHER Comparison ^ Patterns not Included: Muscovite, (135), Tremolite (119/120). Magnesite (16). Most probable minerals present: 'Talc Chlorite Visual Comparison: Talc, Chlorite, Calcite Minerals Present; Talc, Chlorite, Calcite .SAMPLE 140 PLATEY TALC Comparison: Patterns not included? Tremolite (119/120) Most probable minerals present: Talc, Magnesite, Chlorite 'Visual Comparison: Talc, Chlorite,* Magnesite Minerals Present: Talc, Chlorite,- Magnesite SAMPLE 141 GOOD SPECIMEN No.2 . Comparison: Patterns not Included: Calcite (134), Muscovite (135) , Tremolite (I19/X20), Magnesite (15), Dolomite Most probable minerals present: Talc, Chlorite `Visual Comparison: Talc, Chlorite Minerals Present: T'alc, Chlorite J&J-0060757 F IT Z G E R A L D 0 0 1 41 115 Comparison Patterns not Includedt Magnesite (137), Talc (146)* Muscovite' (135), Dolomite. Most probable minerals present; Chlorite, Talc . Visual Comparison? Chlorite, Talc Minerals Present; 'Chlorite, Talc SAMPLE 143 ' FIBROUS TALC FACE IO Comparison: 2 unmatched lines OO 4.8928A, 4.4431A Patterns, not included: Calcite (134), Magnesite (137), Muscovite (135), Treraolite (I19/r20) Most probable minerals Present: Chlorite, Talc Visual Comparison: 'Chlorite, Talc Minerals Present: Chlorite, Talc J&J-0060758 FITZGERALD00142 SAMPLE 144 ' PURE TALC FACE 1 Comparison; 1 unmatched line 1.0798 Patterns not included; Magnesite (137), Talc (142), Muscovite {.135}, Tremlita (119/120} Most probable minerals present; Chlorite Talc, Dolomite Visual Comparison: Talc, Magnesite, Chlorite Minerals Present; Talc, Magnesite, Chlorite ' .SAMPLE 14 5 GOOD SPECIMEN FACE 1 oo Comparison; 2 unmatched lines 1.0882A, 1.0505A ` Patterns not included; Calcite (134), Chlorite (142), Chlorite (14) Muscovite (135), Magnesite (16), Tremolite (119/120), Dolomite. Most probable minerals present; Ta l c ,'Magnesite *Visual Comparison; Talc Minerals Present; Talc CAMPLE 146 COLOURED TALC FACE 3 Comparison: Patterns not included: Chlorite (142), Chlorite (14), Muscovite . (135), Tremolite (119/120). Most probable minoris present; Talc, Magnesite Visual Comparison; Talc, Magnesite Minerals present: Talc, Magnesite J&J-0060759 FITZGERALD00143 117 Specimen Patterns and Comparison' Data for Samples of Old Powders and 00000 Shipments t J&J-0060760 FITZGERALD00144 118 SAMPLE BATCH 6 POWDER Fl PBT.J. 035 Comparison: 1 unmatched line o 8.1972A Patterns not included: Muscovite (135), Tremolite (.119/120} Most probable minerals' present; T a l c # Magnesite, 'Chlorite Visual Comparison: Talc, Chlorite, Magnesite Minerals' Present: Talc, Chlorite, Magnesite ' SAMPLE BATCH 8 POWDER (S and G) PWJ, 035 Patterns not included: Magnesite (16}, Tremolite (Z19/I20) Most probable' minerals prsent: 'Talc, Magnesite, Boric Acid 'Visual Comparison: Talc, Chlorite, Boric Acid 'Minerals Present: Talc, Chlorite, Boric Acid .# ' SAMPLE BATCH 9 POWDER T4 P.W.J. 035 Comparison: 1 unmatched line O 1. 2587A i " Patterns not included?- Tremolite (119/120) Most probable minerals present: Talc, Chlorite, muscovite, . Magnesite, Boric Acid Visual Comparison: Talc, Chlorite, Boric Acid Minerals Present: Talc, Chlorite, Boric Acid J&J-0060761 F1TZGERALD00145 119 , SAMPLE BATCH 10 POWDER SKlBP PW.J, 035 Comparison : * Patterns not included: Calcite (134), Muscovite CI35), Tremolite (119/120), Dolomite Most probable minerals present; Talc, Chlorite, Magnesite, Boric Acid. 'Visual .Comparisont Talc, Chlorite, Boric Acid : Minerals Present: Talc, Chlorite, Boric Acid * SAMPLE BATCH 11 POWDER L D 18P__PW. J, 035 ~ '----- T .. f- \y;i.\; v\:. iif -:%j j .k/ e1r; ) - i i n i J k A h II j t & k iu J .ik itt t jj t i'V ' o Comparison; 1 unmatched line 8.1363A ' Patterns not Included; Magnesite (16), Tremolite (119/120) Dolomite Most probable minerals present; Talc, Chlorite, Boric Acid Visual Comparison: Talc, Chlorite, Boric-Acid, Magnesite Minerals Present; Talc, Chlorite, Boric Acid, Magnesite ' SAMPLE BATCH 12 TALC 1960 PW.J. 025 Comparison: 1 unmatched line o 8,12 A Patterns"not included: Tremolite (119/120) Most probable minerals present: Talc, muscovite, chlorite, Boric Acid. 'Visual Comparison: Talc, Chlorite, Boric Acid, Magnesite l Minerals Present: (Talc, Chlorite, Boric Acid, Magnesite J&J-0060762 FITZGERALD00146 120 SAMPLE BATCH 13 TALC 1961 PtthJ. 026 Comparison Patterns not Included: Calcite (134), Muscovite (135) Tremolite CI19/1201 ~Most probable minerals present; Talc, Chlorite, Magnesite Boric Acid 'Visual Comparison Talc, Chlorite, Magnesite, Boric Acid ' Minerals* Present; Talc, Chlorite, Magnesite, Boric Acid SAMPLE BATCH 19 S.S. 'P rtr ) ft CATHERINA W. 02 /OS /72 iV Comparison Patterns not i ncluded: Tremolite (119/120) Most probable minerals present! Talc, Chlorite, Magnesite `Visual Comparison: Talc, Chlorite, Magnesite Minerals Presents Talc, Chlorite, Magnesite SAMPLE BATCH 2 Comparison TALC S.S. EDNA *B* 14/02/72 Patterns -riot included? Talc (145), Tremolite (119/120) Most probable minerals present: Talc, Chlorite Visual Comparisons Talc, Chlorite s Minerals Present: Talc, Chlorite J&J-D060763 FITZGERALD00147 CONCLUSIONS The optical examination has shown that there are a large number of minerals associated with the rock types found both in the talc seam and in the associated rocks. The footwall rocks in contact with the talc are mainly composed of the minerals quartz, muscovite, chlorite, garnet, and some carbonate material both calcite and magnesite. Minor minerals in the footwall contact rocks include epidote, microcline, tremolite and actinolite, sphene, rutile, hornblende, rare talc, biotite, pyrite, pyrrhotite and chalcopyrite. Rock type inclusions into the talc have similar compositions to the footwall rocks but with higher muscovite and chlorite contents. The muscovite was generally an iron rich variety (phengite), while two forms of chlorite were observed namely sherldanite and penninite. Other talc inclusions consist mainly of carbonate minerals, calcite and magnesite in varying quantities. It is with these nodules that some tremolite is found. The rocks further away from the talc seams, namely the gneiss, become richer in quarts and microcline and below these marble occurs. The carbonate specimens examined by optical means showed that the carbonate minerals, calcite and magnes ite, were accompanied by talc, chlorite, tremolite, muscovite, rutile and pyrite, all in minor amounts. In general the carbonate inclusions were large and very .. discrete in the talc seam Itself. The specimens examined, which can be classified as talc samples, were found to be in the main composed of talc with chlorite as the major contaminant. Some specimens, however, were predominantly composed of chlor ite with minor talc inclusions. Other minerals found in association with the talc specimens included garnet, rutile and magnesite with rare tremolite and a quartz or serpentine inclusion. Some differences were observed in the talc itself, some of the talc appearing to be a little murky in texture. X-ray pictures of the clear and murky material showed no differences however. The powder X-ray examination confirmed the major minerals occurring in the hand specimens and a classifi cation was possible into the three groups already men tioned, i.e. rock types, carbonate samples and talc spec imens. The only asbestos type mineral to be detected in the hand samples was tremolite, which was found in three of the specimens. The tremolite was associated with carbonate minerals, namely magnesite and calcite, no tremolite was detected in the talc type specimens. Chlorite w a s , hpwever, very common in the talc types, some of the specimens being very nearly pure chlorite in composition. There appeared to be some association of the chlorite with coloured talc specimens, especially those w i t h a greyish colour. Other colour variations duet to rutile were not detected by x-ray examination. J&J-0060764 F IT Z G E R A L D 0 0 1 48 I The examination of consecutive samples at face 1 in the mine showed that the chlorite content can vary very drastically over a 6ft thick section of the talc seam. Patterns obtained from several shipments of 00000 talc showed that chlorite, together with carbonate material, were the major contaminant minerals. This was also true of powder samples ranging back to 1949 in which, the only observable difference was the presence of. boric acid* The electron microscope examination of the powdered samples showed that a difference could be drawn between particles produced from the various samples. The carbon ates and rock types on the whole produced compact fibre free particles. The talc specimens were, however, plate like in appearance with varying quantities of lath like particles coupled with fibres which were textile in I appearance. Both lath and textile types of particles were not composed of minerals associated with the commer cial asbestos industry. Particles formed from the I amphibole mineral found at the mine were hardly fibrous in character, the majority of the tremolite breaking to give compact particles. Those fibres formed were short . i and had a very large diameter when compared with the commercial varieties of asbestos. No amphibole or chrysotile mineral was detected in any.of the numerous powders examined. The Italian talc 00000 contains observable quantities of chlorite and carbonate minerals and could contain any one of the following minerals in very minor amounts: muscovite, quartz, tremolite, garnet and rutile. If small pieces of footwall rock were to contaminate the ore during production, several of the other listed minerals found in the rock type specimens could appear in the shipped product. It is unlikely that they would be present in detectable amounts. C3 r.D. POOLEY Project Supervisor t J&J-0060765 FITZGERALD00149