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FILE NAME: Talc (TALC) DATE: 1972 Sept DOC#: TALC144 DOCUMENT DESCRIPTION: Unpublished Report - An Examination of Italian Mine Samples and Relevant Powders u t ' ' . i*" n 11 / i i ; : i V , % :. .= '-l i * ? : '.*. . ' v. .i1 ' ; T.-.;., -'7 s-: A:*' "/! .' . _L-_. DEPARTMENT OF MINERAL EXPLOITATION , K*** - ( . UNI VERSI TY COLLEGE .-CARDIFF ' - J&J-00S042 FITZGERALD00026  AN EXAMINATION OF ITALIAN MIME 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 hers were! Mr. J. Lighfcfoot Mr. G.A'. Kingston Dr. F.D. Pooley Received; 8th September 1972 ' J&J-O060643 FITZGERALD00027 REPORT OP INVESTIGATION OF ITALIAN MIME ' SRMPGSS MSP' RELATED POWDERS O Introduction Talc is hydrated magnesium silicate (Mg3Sii,0 io (OH) *} ' which can occur in a number of forms. In its compact form it is known as stealite or soapstone. The form normally employed for toilet purposes is soft and very friable in character. It is mined in many parts of the world including the U . S .&., Canada, Prance, 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 m _ association with dolomite and marble. Talc also occurs in altered basic rocks such as serpentines and again as than 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 Ccaleium magnesium carbonate!, tremolite and actinolrte (.calcium, iron magnesium silicates!, chlorites (magnesium aluminium iron silicates! and other minor minerals such as the sulphides and spinels. ' T h e 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. specimens were collected with the intention of sampl g - areas with Obvious non talc mineral inclusions. Specimens were retained which showed differences m 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 careful search at the various sample locations in tne taic seam was performed fair fibrous amphibole minerals. Specimens of the hanging and footwall were also collected t o assess their mineral content as these were likely sources of ore contamination, although the method of mining whicn 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 or all hand specimens ^ave been reduced to powder form and subjected to powder tion examination. The representative powdered samples also " fo rm the samples for morphological examination by the electron microscope. ' . ' J&J-0060S44 FITZGERALD00028 T h e list of samples obtained from the Italian, mie are given in Tables 1 and 2 and throughout this report the samples are referred to b y th*> preceding code number for each specimen. . The objective of the examination has been mainly to es tablish. t h e m a j or minerals w h ich .occur in association with, talc at. the Italian mine. 'In. particular to look at the association o f these minerals with, the talc and especially t h ose minerals w hich are of the same family as the commercial asbestos .minerals, i.a. the amphiboles and serpentines. . ' The objective of the optical examination has been to establish textural and mineral relationship and not to quantify t> p ha se s occurring in each hand specimen. X-ray w o r k 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 Cede N o , I.l. ' I,,2. .3 X.4. r.s. 1.6. 1.7. 1.8. 1.9. 1 .1 0 . 1 .1 1 . X.12X. 13. 1.14. 1.15. 1.16. 1.17. 1.18. 1.19. * 1 .20 . - 1 .2 1 . 1 .22.. 1.23. 1.24. X.25. ' 1.26. , 1.27. TABLE X LIST OF ITALIAN MIKE SAMPLES * ' Description *. Talc from -footWall contact . Sorting pieces Cwith. obvious colour differences) Coloured talc Cgreenl Face 10 saiqple with, obvious amphibole inclusion. General ore Suspected Quartz sample Mica schist specimen * Massive talc Grey talc 1st face ` Granular talc sample ' Carbonate and talc ' Foot-wall sample? Amphibolite ' Inclusion shoving 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 1212 Inclusion from face 2.. Carbonate/talc sample Black gneiss 2 ft below talc seam Talg next to carbonate face 2. Footwall limestone ' .Talc inclusions Lithological inclusions face 1 J&J-O0SO64S FITZGERALD00030 4 Table 1 Continued Code Mo 1.28 1.29. 1.30. r.3i.1.32.. I,,33. Xi34. I' 3 5 . . 1.36. 1.37. X'. 33 I ; 39. . 1.40. 1.41. 1.42. ,1.43. 1.44. X. 45 . X.46. Description Quartz/talc sample Sample 6 footwall . ___ Quartz/Carbonate/talc sample ' Black inclusion face 1 Pace 2 inclusion from base of talc *alc from lower left end of working ' Marble/tunnel wall Massive carbonate from rear end of working Grey talc specimen Carbonate in talc inclusion Pyrite/talc specimen 5" ** 0 pieces from crusher Platey talc P a c e 2, good specimen Fac e 1, coloured green CtalcL Pace 10. fibrous sample P a c e 1, pu r e talc? P a c e 1, good specimen - Pace 3, coloured specimen 4 * J&J-0060647 FITZGERALD00031 'Code No 01 B2 - B3 B4 B5 B6 B7 B8 B3 TABLE 2 'OTHER SPECIMENS SXAMTWBn ' Description ' ' Pure talc 1st face Greenish. talc 1st face . - Talc S Inches above footwall Talc from above inclusion Inclusion In talc Talc 2 ft above inclusion Section 2 Et above .inclusion Pure talc 1st face Grey talc 1st face Also examined 1) Batch, shipments of 00000 talc 2) O ld samples of British, powders.i i J&J-0060648 FITZGERALD00032 OPTICAL EXAMINATION OF SPECIMENS II - I4S Thin and polished sections were -prepared of the specimens of wallrock and, where possible, the talc ore. 5 uimerais which, formed <*. major constituent in at least one of- t he sections w e r e quartz, muscovite, t a l c , chlorite, tvar sneridanite), calcite, garnet, and tremolitei the latter u* i.OCCUrred as a 1?a ir constituent in section 1 1 9 .- Phases-- which were always minor or accessory were microcline, plaqio- lase, biotrte, p e n n i n e , epidote, clinozoisite. hornblende, se<:t\on.17 ^ aiL opaque'constituents pyrite. pyrrhotite, and chalcopyrlte. 611---- 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 (PFLJ and crossed nicols (XN}, combined With, the results of t h e X-ray diffraction study of the crushed hand specimens. In some cases material was extracted from the sections ana examined in R.I. liquids as in determining that . most common chlorite mineral in these specimens is a variety called sheridanite having a R.I. cu equivalent of 1 590 0 005 and a birefringence of 0.012 - 0.014. Similarly much of the muscovi.te was nearly uniaxial with a R.I. of 1.600 correspond ing to th e variety phengite, an abnormally siliceous muscovite, j" case of talc its confident determination optically is since its optical properties are identical to musco- v ^t e - H & w e v e r , it was found that the common `'feathery" form of tha talc combined with, the invariable occurrence of minute transparent inclusions (suspected to be silica) in the talc producing a 'dusty1 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 pa ges (no - 7 to 48 ) the Italian ' specimens are systematically described as regards their mineral -composition and mode of intergrowth. Numerous photomicrographs taken under FPL and X N 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 amphxboles in the talc ore.' J&J-00S0S49 FITZGERALD00033 Specimen T1 Specimen II consisted of several pieces of wallrock with, one piece displaying the talc/foofcwall contact. One polished section was made of the talc/footwall contact and one thin section of the wallrock alone. . 3?he 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 lontj tabular aggregates of intermixed muscovite (var. Phengite) and chlorite (var sheriUa-' n i t e )., and granular quartz exhibiting a polygonal grain boundary structure. Accessory rutile occurs as'orientated inclusions in the chlorite and muscovite, and also opaque con** stituents w h i ch in polished section were identified as dominantly pyrite metacrysts with minor pyrrhotite. Some subhedral porphyxoblasts of plagiocl'ase also occur. *v *i \ y \ * * ' ^ W :': . 'X .1 ; -.'A .: % v } K \ , {\ .*- S NS pi. ?/?' * w v ~i * : V" v*. *,*\', Ts'ii "* ` =' ' ;5 \tS*/rV >.' ....;:<a ' .v.' - , . -S <:-y. '* Vf:..; ', ^ V \- ' v * : - s *, v\ .* : %-s4 Fig. 1 . Photomicrograph, X 4 0 r of thin suction of wallrock II under crossed nicols. A schist of quarts (granular white-black), muscovite (lamellar yellow-blue), and chlorite (lamellar white--blueish. grey). Specimen 1 3 ; '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 transparent inclusions along the cleavage planes and grain boundaries of the talq and imparting a dusty brown appearance t o 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 'd u s t y ' and grade into `clean' ' transparant aggregates w hich are free of any inclusions. It appears that some retrograde metanorphic process has caused the inclusions to be removed or incorporated into the talc Afr^ucs-f-**- (iinrp inal/ i*a1rr rrv<5i*ls r i U n t n v h n r o To J&J-0060S50 FITZGERALD00034 a minor chlorite is dispersed in the talc matrix as small . lenticular ana globular fibrous aggregates. Rare garnet, possi bl y a member of the ugraridite series because of its anisotropy, occurs as subhedral porphyroblasts. \ Fig. 2 . Photomicrograph, X 24, of thin section of 'coloured talc' specimen 13 under crossed nicols. Dominantly talc (yellow-blue interference colours) showing murky brownish black, patches d ue to presence of fine unidentifiable inclusions. Specimen IS; general ore' A coarse aggregate of curving foliaceous and feathery Crystals of talc displaying evidence of shearing and translation twinning. As in specimen 13 , 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 taic is cleansed of these inclusions along zones 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 tremolite to talc by low temperature C 0 2 metasomatism) or incorporated into the talc structure as a result of retro grade deformation metamorphism. porphyronlasts also occur. Rare small subhedral carnet . i J&J-0060651 F1TZGERALD00035 9 Fig- 3 . . Photomicrograph., x 24, of thin section of' 'general ore specimen 15 under crossed nicols showing the texture of the talc, and the 'murky inclusion-rich talc compared to the clear inclusion-free -talc. Specimen Ir Specimen 16 consists of a very coarse aggregate of inter locking anhedral magnesite grains w h i c h exhibit strongly irregular and angular penetrating grain boundaries. The mag nesite is characterised in thin section, Fig. 3a, b y its marked change in relief and perfect rh-oirthohedral 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 c h lo r it e (var. sheridanite) 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 metamor-- phism 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 I n i ttv Ir; s , . -i Mi.- l / ./////./ { & ' /? .- :r**i".*-y**. .'I*'/^.':rjr.:'//,>>.~?'.y-j._..'-r .- 5 ' .-V -.`"1 J. ['://.?.. V'-'i'4 -y-VV.:-;r Vi>, "*. V : ^ ' . *h- 1 i *' ...* 1 * <' 'yd ''-L >. .s .-"i;- V.Ti.. 'v, P- : / ' *..< Jl .''>.T'Ki ...- Fig. 3a. Photomicrograph., x 24, of thin section of specimen Is under p l a n e polarised light, consisting dominantly o f magnesite with- minor talc and rare chlorite. F i g ,'3 b . Photomicrograph of thin section o f specimen Ig, m ag x 24, under crossed nicols showing the occurr ence of small equigranular and prismatic crystals of talc penetrating and interstitial to coarse anhedral magnesite. J&J-O060653 F1TZGERALD00037 J.J. Specimen T7 This specimen of wallrock is'a quartz-muscovite-garnet schist (Figs. 4a, 4b, and 4c) containing some accessory ' actinolite, 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 euhearal porphyroblasts of garnet, forming one of the major phases, are dispersed throughout the rock. Accessary subhedral tabuiar and rhombic sections of actinolite (colourless to bluish green pleochroism) occur, orientated parallel to the schistosifcy. The actinolite also occurs as rxms-to euhedral grains of rhombic and tabular outline which, m a y have- originally been brown 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 pyrrhotits occurring as subhedral laths.lying parallel to the schistosity. Traces of chalcppyrita also occur, and some rutile rods mainly as inclusions in the .garnet porphyroblasts. Fig. 4a Photomicrograph of polished section of I7 showing . pyrrhotite (white), garnet Clight greyl, and muscovite-quartz (darker g r e y ) . .Very dark to black areas are pits in the surface. J&J-0060654 FITZGERALD00038 12 O'*" fit. ? V *? . '...^X :-r . .. - sf-.r~ .. A - A-.' ?' ' -J:-- vr v\ , 1 -I'? . 7 J&ff. a ' & ^ v'3r*.~ ? * ` h'.-i##?' f* A ? .'. S* f-. -.-.A -''.. / i '/^> / :/- - ' A A ^ Fig. 4fa. . Photomicrograph, mag. x 40, of thin section o f I7 consisting of garnet, muscovite and quartz under plane polarised light. . r ---\ / Nv\ .v f y ;v -^ '..>>/ / 97 f > I :\Ay _< ..a I .'A" " 9 A ' V v>^' .j >t 1 xA'-'*"../ r ' J.-- >r . Af9 Fig. 4c. Photomicrograph., mag. x 40, of thin, section of 1 7 under crossed nicols showing suhaedral garnet Cblack), anhedral interlocking cuaxtz (white-greyblack.), and lamellar muscovite icoloured). J8J-0060655 FITZGERALD00039 Specimen la 111 hand specimen I8 appears as a coarse aggregate of foil- aceous talc varying in colour from white to greenish white." The general texture in thin section is of coarse foliated talc orientated and alternating wit h long lenses of- a finer t a i c x r t w h i c n a preferred orientation appears to be absent Chlorite11fvarf ^ earJ n 3 Paraliel to the schistosity. Minor Chlorxte (var. sherxdanrte) occurs as orientated laths intimatelv Y ith_ the coarse talc *and as fibrous aggregates in the^ finer talc lenses. Rare anhedral garnet, possibly pyrope, occurs. s c e c t o e n ^ i ^ ^ f o 11^ 5 tai c whch appears greenish in hand n?n?!h m, f be crowdea with minute inclusions of a Int nerai occurring as rounded to thin tabular grains and h a v m g a lower refractive index than the talc. A grey-brown amorphous material is also present. This material together with *n<:lUSiar^ 1 5 P resun>ahly responsible for the greenish, colouration ox the talc in hand specimen. As in 13 and 15 the ^ree^ s^L talc has been clea-nsed of inclusions along planes SChf St?ity sorae later metasomatic process or retrograde metamorphxc process. This 'absorbtion' of the inclu sions by the talc or removal of the inclusions, does not effect1 the form of aggregation of the talc crystals. Boundaries between. S h , ^ o an, tra^ PaKent 3115 ,IRUrky' talc often transgress the laSenovtnn n change in the coarseness or mode of .?g*; fche taic across such boundaries. x-ray diffrac ts?^ transparent white talc and the translucent greenish, ale revealed no Inferences and the composition of these is at the moment unknown. Figure 5 , under crossed niois, snows such, a transgressive boundary between the clear and. 'murky* or dusty talc-. Photomicrograph, mag x 24, of thin section 1 . showing * j future of tiie talc intergrowth under crossed nicols, ana tho transgressive bound.-i.ci.dTr betwcun-clc.ir tr.in::-- parent title mni tluj IticLimi.oiiTrleh 'murky1 tale which appears greenish white in hand specimen. J&J-006D656 FITZGERALD00040 14 Specimen lg; 'Grey talc 1st race1. . In specimen Ig talc and chlorite (var. sherldanite} ire 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 a nd w h i c h fo r m lenses elongated parallel to the. schistosity o f the coarser foliaceous talc {Figs. 6a and 6b ) . As in previous sections the talo 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 . Saxe subhedral porphyroblasts of garnet {possibly pyrope) also occur. . Fig.- 6a Photomicrograph., x 40 mag, of thin section I g under plane polarised light showing subhedral garnet grains in an orientated foliaceous aggregate of talc and chlorite. J&J-00S0S57 FITZGERALD00041 15 -i y'{\,...Vr* ' V -'`.'.i....y>1'<'..'. \."1..1 ;:Vi : \ ,iV i= = fe! fti--v r - ^- V" .1 ;V ^ ' : , .3>~v. - - y .W.X.-- - - - .\ ..v i V * V.'.'V--- . , />:' p v - < r ; Tig. 6b, y Photomicrograph., x 4 0 mag., of thin section Ig under crossed nicols showing garnet (black) in a coarse matrix of foliaceous talc {bright interference colours) and chlorite {white to blue-grey interference colours). t J&J-0060658 FITZG ERALD00042 16 'Specimen' -Im and' I m a : 'granular talc' ' Both. Ij_q auid 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 ta*lc is not crowded w i t h inclusions as is the case in most of the other samples. ~ fftK- VK v* . --' Fig' 7 . Photomicrograph, x 40 mag., of thin section , under crossed nicols,- consisting of talc (blue and yellow interference colours}, chlorite (white a nd greys), and garnet (black)- Specimen I i i : '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. 8a and 8b) . . The talc is crowded with near sub-microscopic inclusions of a ttansparant 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 J2J-OOSOS59 FITZGERALD00043 Fig,- 8a " Photomicrograph., x 24'mag., of thin section I]_i under plane polarised light showing a subhedral pyrite metacryst CblackJ in a matrix of compact .granular magnesite with, interstitial" foliaceous talc Ctop centre). S`J**"'"* . . -V i-d; /y, '{ V- 'i; f}V'- --V(Vf r:j li-'" Y.: .* ; % .t,r \ vT'-VV,;"r'1.!-*t .r ' / . *-** 3 * "} ,,-V J Fig. 8b. . Photomicrograph, x 24 m a g . , of thin section X u under crossed n Lcoln showing a pyrite motacrynt bl,:fc) in rt'i|iMmilni- mngtu-.ti ll:u matrix, wll.h a foliaceous interstitial aggregate of talc (top centre). ' J&J-0060S60 F1TZGERALD00044 Specimen o ' 18 . , **} a??reSate of anhedral quart2 as the main' constituent with.^minor interstitial muscovite and green chlorite fvar o r i o i t el-F 1 ? * 9o>,i Tile long fflu'scovite laths ihow^-pr ef e r f ed ^ orientation. Chlorite occurs in interstitial pockets as randomly orientated pj.aty grains. and a trace of magnesite. Some epidote is present ----- F ^ s e n u chlorite displays a pleochroism from light green to brownish-cream, and anomalous blue interference colours in However, most of the chlorite grains display order to upper first order interference colours. iiTtiJl section* Cia0r:Lte composition is probably represented ' '\f'.i .-.-.ji X y - ; . v.-: ^ V :T ; . . ta-. >***ta` **` S3 * . : wn/-.. f ' Fig. 9. Photomicrograph, x 40 mag., of thin section Xi > under crossed niois- ' Specimen Xt g ___ T his _specimen ponsists of an aggregate of mainly medium grained p la^y to ziorous chlorite (vnr. sheridanite) and eguigranular cuarfcz' These two enclose ragged replacement residuals of calcite and subhedral metacrysts of pyrite with rare- chalc oovrite. ^ ----- JS.J-006Q681 FITZG ERALDO0045 19 V `Cv^-: / ' ''T ' " ;.:.JiiSJ v ' ; . .V - A.*.. V - S v > \ fi v ,,t *:-'f.'. P x \ - :/ i . :- Pig.' 10a Photomicrography x 40 m a g , , of thin section 1^3 under PPL showing subhedral pyrite meta~ .' crysts (black) in a matrix of dominantly . 1 chlorite and quartz with, minor calcite. V- ....- : ' i' ' : v.- .'/ J. .\ kV \ ^ : S - : ? ; ! : / / -, , " ' ' :iOb ' i ,, Photomicrograph, x 40 mag,, of thin section I l 3 under >0 - showing chlorite (fibrous white and greenisn-grey) and calcite (coloured) enclosing subhedral grain of lyrlLti (tituck) . Equigranular grey grains are quarti. J&J-0060662 FITZGERALD00046 Specimen , This specimen is dominantly composed of verv ,,,,a- ,, , ^ | U e icta.ln, iox a,o,,,,L oP? S a n V S y " ^ * chlorite j v ^ sheridanite). The t a l F T n d chlorite form IIIS* Tla! " k *" "9 " tollacaoua c i y S u L TM .,, Fig' 11a ' Photomicrograph., x 24 m a g . , of thin section Iv > under PPL of coarse magnesite and intergranular pockets of 'dusty* and 'clear' talc. Fig. 11b Photomicrograph, x 24 mag., of thin section under XN of magnesite (greenish) and pockets of radiating lamellar talc thlue, purple, yellow). J&J-0060663 F1TZGERALD00047 21 Specimen' I k s . . ' This specimen of wallrocfc is -a qamet-muscovite-quartz ' schist w i t h minor green chiorrite, blotite, and rare talc and feldspar (Figs. 12a and 12b). ` " ' T h e garnet occurs as large (l-3mm diant.) porphyroblasts altered along irregular fractures to a mixture of greenish chlorite, biotxte, and some feldspar, and enclosed in a matrix composed- of orientated tabular grains of muscovite, forming elongated lenses, and alternating with, 'mosaic* granular quartz containing randomly dispersed biotita and chlorite flakes. r~~7 5 A V-; ,-v ' ' (' \ !-"\ i -.->V.;.> iV.--. V * 4*.mV ' _.kju ' Yv % V -. ''/-vt.' < Pig.' 12a Photomicrograph, x. 24 mag., of thin section IlSfc. UNDER PPL showing a large altered porphyroblast of garnet in a matrix of dominantly muscovite with minor quartz. J&J-O060664 FITZGERALD00048 22 < F*-' -'i . .->> >/- " . '. *1 . * ' P . VoT `V - : i '' >>-.% : V i -i- .'>' - -.Sr. ' v:v \ b. - ^ \ \ ' : r . \ :'f ' 1 A*^vC '? ' ,^ * -*.*\ t -x . .i ' v\uviK** hs.'-^'to \W.' - ) tit gig. 1 2 b .' . Photomicrograph., x 24-mag., of thin section ii5A under crossed nicols. Garnet (hlacXl, Muscovite {dominantly purple interference colours). Quarts {white and greys). i J&J-00606S5 FITZGERALD00049 Specimen Snd a schxstosxty. S S te i s .dominantly composed of chlorite fvar. -- r-- as orientated aggregates producing very minor amounts of magnesite L i ' J i f " thi" I SS^ ` TM *-s& gj-g.; l'3a Photomicrograph, x40 mag., of thin section lie under PPL showing the irregular hut preferred elongation of .9 f a m l l a r segregations in a matrix of fibrous chlorite ( v a r . sh.eridan.lte). ' fl? 33b Photomicrograph, x 40 m a g . , of thin section Iig under XN, composed of chlorite (fibrous white, greenish 'grey, black.), quartz ^granular vhite-grey-blacJO, and talc (blue, red, and yellow interference colours). J&J-0060666 FITZGERALD00050 24 Specimen' Iifi: 'first face inclusion' This specimen is composed of a medium grained aggregate of domi na n tl y chlorite (yar. sheridanite) and quartz, with m i n o r m a g n e s i t e , ciinozoi'site,' t a l c , a n d muscovite, and displaying a poor schistosity. Scattered euhedral to sub-- hedral' pvrite metacrysts occur as well as medium grained crystal aggregates of rutile associated with clino2olsite forming 'stringers* parallel to the general schistosity of t he rocjc. ' In the photomicrograph of figure 14a the brownish speckled' areas are dominantly chlorite although in Figure 14b talc and. m u s c o v i t e are more apparent because o their inter ference colours. Figure' 1 4 a ' Photomicrograph, x 40 mag., of thin section Ilfi % under PPL.* i K * J&J-0$0B87 FITZGERALD00051 0 *;, Vv'-i. . : ^ / i-;^N : - ?..* \V 'V - A iV-. v '.';*4 ''--`v.,u. - .v v ~ "- i> 1 '' . ' / t- v . Ok .v/. .T--..>s . ^ . t .`` M* .'... ] ) ; v*i >0 Tlq,' 14b Photomicrography x 40 mag. r o thin, section under crossed niois. A chlorite - quartz roclc with minor talc and muscovite, and accessory magnesite, cimozoisite, rutile and pyrite. - . v J&J-0060668 FITZGERALD00052 Specimen X?-?: /`footwall* This specimen of footwall rock. Is a muscovite-guartzgarnet schist consisting of long lenticular anhedral quartz aggregates. Both, are enclosing fractured and altered euhedral porphyroblasts of garnet. Accessory sphene also occurs as well as serpentine-quartz pseudomorphs after a mineral d 1ti pi eying rhombic and tabular sections.- Fin.' 15a "" " Photomicrograph x 24 m a g . 'of thin section I^y'under p p l showing garnet euhedra in a matrix of segregated quartz and muscovite. .'. . V'** . % F * * . #i,V * '?" ' "s"- 'rir. . >75*"*. \ - V' .-.A. l _ '" i - j y ^ f . ^ 4* eS/v fZ - r v * V > \k . 'Itc VWV --A J / '. P -i. ' ^ - nv.-'' *\ ' <s V -ifi- Vi & f # 0T-v ' X'J Ficr. 15b Photomicrograph, x 24 mag., of thin section l a u n d e r -- ' XN. Gatnet ( b l a c k ) q u a r t z (white to grey), ana muscovite (.lamellar and coloured) . J&J-0060669 FITZGERALD00053 'Specimen' ; `Face. 3, carbonate/talc* ' . A coarse to medium grained aggregate of subhedral inter locking grains of magnesite with, minor talc occurring as scattered small interstitial clusters associated with rare chlorite (yar. sheridanito) and muscovite (Figs. 16a, 16b). Fig, 16a . Photomicrograph, x 24 mag,, of thin, section 1x8 under PPL of granular magnesite with., scattered tabular crystals and clusters of talc. pig, 16b . photomicrograph., x 24 mag., of thin section Iig under XM of granular magnesite thigh order interference colours, 'and scattered tabular crystals and clusters of talc (top right, coloured) and rare chlorite 1(white.to blue-grey colours). . J&J-0060670 FITZGERALD00054 apecxmen i q - . . ' This specimen' consists o an aggregate of ^rse quartz 0?igs. 17a ^ 17b). t . U V 24 maq., of thin section o Ii*- J 2 & ^ " S r ^ S w i n g coarsi felled tremolite inter- _ under BPL, sbowinq arained magnesite- J&J-0060671 F1TZGERALD00055 Specimen -Ifrii 'Inclusion, faca 2 . Specimen X21 is composed of Af anhadral magnesite, S S d <*tteTHK fibrous aggregates of vecy minor a fine grained interlocking as the ma]or constituent, talc (Pigs, 1 * 121 J *3" S 2 ^ SL J&J-0060672 FITZGERALD00056 : 30 Specimen 177. ' This specimen is dominantly composed o coarse subhedral to e u S S a f l n S r l o c k m g grains -of magnesite associated with intergranular fibrous clusters of tele whrch often.ene o^____ smaller euhedral magnesite grains Trig. 19). . - , , , i t l y. ___ ____________ _ --- ?.ri `'V-' '.^Crv : i1' 4 'wiv/''i i '.-' 1 / I <r--..: ...Vi.- r-- r7.1 -r -- .} M w.VT-^v-. 4 v ^ - ;-:% ' V .4 .A !.-.? U .c*-.~ " Pic. 19 -- ---' Photomicrograph, x 24 m agnification, of^th^ anesite section X 22 P lane polarrsea rigno. y . and interstitial aggregates of talc. J&J-0060673 FITZGERALD00057 Specimen 1-23: 'Black Gneiss 2' below talc vein' Specimen 123 consists dominantly of medium grained anhedral interlocking quartz as orientated bands enclosing large micro cline anhedra and anhedral -aggregates. Scattered plat? . aggregates of muscovite occur orientated parallel to the general direction of the quartz banding. Minor epidoto and oh lorit also occur (Figs. 20a and 20b ) . ' ' Pio. 20a Photomicrograph, x 24 mag., o thinjsection^I 23 under ppt. Quartz--rauscovite-microcline gneiss. 2?V / ;' ' . " r t-i.r :'.Y y `U . t . J.'.'i >. 'U"*. ` ' .O <2 1 f .-/Vi ''I '.* -- Fio. 20b photomicrograph, x 24 mag.. Of *23 -- 2----- under XN. Quartz-muscovite-raicrocline gneiss. J&J-0060674 F1TZGERALD00058 Specimen Ia4 y,.:;-*gaca 2, .Talc.next t o 'carbonate' This specimen of talc ore consists dominantly Of coarse fibrous talc with minor chlorite tvar. sheridanitel occurring as small lenticular fibrous aggregates within the main mass of tile (Pigs 2 1a and 2 1b ) . A few small subhedra of garnet are present. As in previous specimens there are two forms of t a c present; (1 ) a talc that in thin section appears brown (Flg.2U ) H K ^ i a n e polarised light due to finely dispersed dusty inclu sions of a transparent mineral and a brown amorphous material, S. % _ tranunarant talc free of inclusions which appehru to -i : ^ 1 V' : ; -r-* ' . of chJ.oifl.tB. . fr. . c ;' ' " f . r ... ..7. .7 . '.* . . : ' i. *t -v *- v.t a T f .. ``i t .bi .v-/v, .. .... `tv** . ^ ^ ^ "'* - ' JSJ-0050675 F1TZGERALD00059 This specimen of footwall rock, consists of an. interlocking aqqreqate of medium grained anhedral quartz enclosing occasional large anhedra of microcllns feldspar (Figs. 2 2 a f22b). Minor maanesita occurs as pockets interstitial to the quarts, and also scattered Laths of muscovite. Green chlorite (gonnine)and epldote occur in trace amounts. ' . Po-i'i Vv?.,i f e .y - . muscovite and rare pennine and epidote. m,:-c 'U-.V-- Ptq.- 22h -- ., o thin section 125 m d e r Phntomiqrograph., x 24 mag XN* JS.J-0060676 FITZGERALD00060 Specimen 126 ' ' ' This specimen contains' c h l o ri t e , t a l c , magnesite and' rutile O n e 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. sherldanite) intimately intergrown with, minor quantities of fibrous and platy talc (Fig. 2 3 1 'as well as scattered small equigranular and rod-shaped r uti4le crystals. ' ' ` 9 9 Photomicrograph, x 40 mag., of thin section. I2S m er -- ---- crossed nicols showing minor talc (coloured) inti mately intergrown with, major chlorite. ' - 1 1 J&J-00S0677 FITZGERALD00061 Specimen 1 27 Specimen I27 Is dominantly composed of quart2 , chlorite (var. sheridanite) and talc (Figs. 24a and 24b). Thin ` lenticular bunds of coat.-tu tVathoLy L.Uc and chlorite altornfttu with anhedral granular Interlocking aggregates of quartz. Scattered Inclusions of rutile and opiiioto occur, uu wull an occasional large mlcrocllim anhedru. pig. 24a Iki&td w In, "'~ 'V- sw-l>-v" y- W i v ^ 's . * Photomicrograph., x 40 m a g . , of thin section I 27 under PPL, showing a fibrous and feathery aggregate,of talc and chlorite enclosing anhedral segregations of quartz . ... ^ ^ ;* I * -**>" ' ' V-'-:r ' V: . ' L - . ^ ;d v w _____ Fig. 24b Photomicrograph, 'x 40 mag., of thin section 127 under JSJ'00S0878 FITZGERALD00062 Specimen I23 36 . _ Specimen I 29 is a'gneisslc rock consisting of segregated >bands o f medium to fine interlocking anhedral quartz grains *alternatdLng with minor muscovite as'orientated platy clusters and enclosing large microcline anhedra. Some rare pennlne . and very rare epidote occur intergrown Vith the muscovite. X . }>: .. F V..' X .V.S nXz'X: '>:f '] "' X. ' 4 i-irJi'i -'- tiiSi tf.i '-w'-Va `.\ Fie. 25a --- a-- -- Photomicrograph. x 24 m a g ... of _thin section ^ g ^ n d e r ppijj quartz; muscovite, and ricroclir.e (top left) v.r . -V - -T."'* ? 'r r X --''k < .;. 5v , :\iy . 1 y I'V"; "" '.KdV ' I fl t * Pic. 25b .:?i- _f.t.J 4 ` i . ' i \ hi.-- . * Photomicrograph, x 24 mag., of thin section'129 wider J&J-0050S78 FITZGERALD00063 1 37 Specimen ' . . ' " Specimen I3 1 is a muscovite-quartz schist containing minor P ennine,' sphene ana tremoiite. ., ' The rock, is dominantly made tip of coarse orientated lamella segregations of muscovite intorgrawn with flakes o f minor g n o m ish brown chlorite (pennlnc.) and enclosing LM.1hudr.1l to uubhudiul grains of sphene. Minor interlocking' fine to medium grained quartz segregations occur alternating with the muscovite band1 . Hexagonal sections of an amptilbolo, probably tremolito, occur dispersed in the muscovite matrix. " v * .... ' : : .. . ' a-Vl- 4 , ;> - j . '. m 'y-. ' i- . '*. i 'ir ' . .V ^ .. *- -*.- -v- ': . . , k <-- * Fig. 2a Photomicrograph, x 40 mug., of thin- section I3 1 under PPL; muscovite-quartz schist. Fiq,' 26b Photomicrograph., x 40 mag., o f thin section 131 " '. under XM: muscovite-quartz schist. J&J-006D680 FIT26ERALD00064 38 Specimen I-!? This specimen consists of coarse feathery lenticular aggre gates of dominantly chlorite (var. sheridanitej intimately intergrown with m inor amounts o f talc (Figs. 27a and 27 b ) . . 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. ' ' Fig. 27a P h o t om ic r og ra p h r x 24 mag., of thin section I 32 under XN. F e a t h e r y .aggregates of sheared chlorite (white to greenish grey to black) with minor talc (coloured). J&J-0060S81 FITZGERALD00065 Specimen Irg t . This specimen of talc ore consists of a medium to fine grained' randomly orientated intergrowth, of dominantly talc with, minor' chlorite (var. sheridanite), The chlorite is intimately m i xe d with, the talc (Pig. 28). Some pockets of coarse interlocking anhedral magnesite grains occur enclosed by'the talc-chlorite matrix. _ F i g . .29 ' Photomicrograph, x 24 mag. of thin section I33 under XN-' 1 J&J-0060S82 F1TZGERALD00066 40 Specimen I35 v ' This specimen consists dominantly of magnesite as a very coarse to medium grained interlocking aggregate o euhedral to subhedral grains. Minor tremo lite occurs as long prismatic crystals forming interstitial clusters, and as solitary crystals penetrating the magnesite and along the grain bound aries o f the magnesite. Minor chlorite (var. sheridanite) and TFprtf. ta'lc occur associated w i t h the tremolile segregations. '(rigs'. 29a, 2 9 b ] . Fio. 29a Photomicrograph, x 24 mag., of thin section Igs under PPL. Magnesite-tremolite-chlorite-talc rock. Fig.' "29b Photomicrograph," x 24 mag., of thin section 1 3 5 undi-r XM. rrir-matic fcromolite in magnesito In the extinction position. J&J-0060683 FITZGERALD00067 Specimen Irr This specimen consists dominantly of magnesita with minor talc The magnesite occurs as an aggregate of very large magnesite anhedra enclosed by finer grained subhedral magnesite Mh-if'h is intergrown with feathery intergranular clusters of talc {Pig. 30)- \ ' . / ' . Pio 30 ' Photcmicrograoh. of thin section 1 37 x 24 ma<3-> XN showing the finer intergranular magnesite associated with, small laths of talc {fibrous an colourdd) - ' J&J-00S0S84 F1TZGERALD00068 42 Specimen' . . ' " ' ' This specimen is dominantly composed of talc forming coarse feathery aggregates intimately intergrown with minor finer grained chlorite ivar. sheridanite) and containing fine disseminated inc lusions of r u t i l e . 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 'par t crowded with, inclusions, as in previous sections, but elongate a reas of 'clean1 talc occur as in Pig. 31a. . v ' - - "rf&\ 'V. J ' gig. *3la Photomicrograph* x 24 mag'. * o thin- section I 39 under PPL .r n r ^ l fc--;v- i.r; Fig. 31b 51..?i;y,lu;i>...r.KL&Ji**;'*-*Photomicrograph, x 24 mag., of thin section X3 9 , undor XN J&J-00606S5 F1TZGERALD00069 Specimen Idi this specimen of talc ore consists of a coarse aggregate ' o f feathery 'talc intimately inter grown w i t h minor' chlorite {var* sheridanite), and enclosing rare large porphyroblasts o f suhhedraL garnet -which, occasionally contain long prismatic inclusions of tremolite -trig.32a) _ y V gig,-32a Photomicrograph., x 24 mag., of thin section I41 under XN. Feathery aggregate of talc with, garnet porphyroblast (bottom right, black). - > JSJ-OOSO6 8 G FITZGERALD00070 Specimen' I 42 'No. 1 Face, green coloured' Spcimen I42 consists dominantly of an aggregate of fine grained fibrous chlorite {var. sheridanite) intimately i n te r - grown with, minor ver y fine grained talc as in Fig. 33, . . ^ 4 \ Fig, 33 ' * Photomicrograph.,-x 24 mag., of thin section I42 under crossed nicols of chlorite (white, greenish. grey, lack:}, and fine grained talc (yellow}. ' t J&J-0060687 F1TZGERALD00071 45 'Specimen: Id 3 : *Face'10 Uhrous sample1 Specimen I43 consists dominantly o f chlorite (yar.- sheridanlte), occurring in the form of a coarse sheared fibrous aggregate intimately intfergrown with very minor talc as in Figure 34 . Fig 34 Photomicrograph* x 40 mag., of thin section I43 unde . crossed niois showing d e f o r m e d fibrous chlorite (white-greenish grey-black) intergrown with platy . ' and prismatic crystals of talc (coloured) , 1 Specimen Iiia. A s for I43 the specimen consisted dominantly o f chlorite (var* sheridanite) with, very m i nor t a l c . *rhe `cross fibre**" type texture found in I43 and produced by shearing at right angles to the schistosity was absent in specimen I43&. ( J&J-0060688 F1TZGERALD00072 Specimen_X44 'First face pure talc" lntate into.-grouch, of iari| o| oSoenEl^ f- `.f1 . ; Sis s r sprsesesnts. see also description for I4s5.- . 03S i - lh r-`- .ow >rj, ?>|^,*5 .' " *:. .. -:s'Su-.-V- .>;.:'.M ;-.'-V:.; -. & * 3 ' > v n v 1 --."-) -- g* 35' . Photomicrograph, x 24 mag., .of section I4 4 under crossed n m o l s showing coarse lamellar-talc enclosing rare anhedral segregations of probable serpentine-sjuartz composition. J&J-00S0689 F1T2GERALD00073 ' Specimen 1 4 5 'Nol good specimen' This specimen of 'talc o r e *, consists nearly wholly of ' ' talc oc curring in the form of a randomly orientated 'matted* aggregate of fibrous talc enclosing minor quartz-serpentine augen. A s in previous sections the talc is rendered murXy or dusty b y fine inclusions of a brown amorphous material and a n 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). v 'M. !. ,* ' ->"/ *"i*'. Vi ?& Z I : ' ' \ > .i.W` -AV ' * A 1 * ? # - ' . V_.tyjf * "_-'a-. A:Cl( a:. ' Fig. '3S 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 ` " - ' *murjcy* talc and the linear transgressive zone of c l e a r * 1tal c , ` J&J-0060690 F IT2GERALD00074 Specimen.X4gi *No.3 face, coloured' T&I3 enclosing rsaOpreeclio.mnehgnecfdiobrnersloiups=tsrsPanhodf, rvf eS,,rtvbbclSn^afwoSll% ^ S2 Sf `1T`1?1S t I J&J-0060691 FITZGERALDOOO75 49 DIGESTIVE TESTS . aa th? pre^ ence of acid soluble carbonate'material < help tte of carbonate present in the a ? e s t lleCfced'eaCh' pOW3er specJjnen was subjected to g r a m quantities of each, of the powders wer e treated 7or n 0rrh^ h-ydp chJ-oric acid for several hours at approximately J ?* residues were reweighed and the filtrates were Y f - . u 211,calcium and magnesium content using the EEL. 240 atomic Absorption Spectrophotometer. The. aim of the " \ * ? t si5" ate 1:66 total acid soluble fraction establish, the carbonate minerals present and to estimate roughly their quantity to help interpret the x-ray powder photographs obtained from the samples. r e fu p ts are P resen`t under- three headings, namely R o c k Types , Carbonate Specimens', ana 'Tale Specimens*. ^ can be seen that only small quantities of carbonate a r e present ** the talc specimen group, similarly in f ?k specimens -with the exception of the'marble specimen CallYJ-00^ caJLcite' The carhonate group of specimens appear to be mixtures of calcium and magnesium ' carbonate w i t h a number of specimens being possible .dolomites. t J&J-0060692 F1TZGERALD00076 ROCK t y p e s j Specimen No. 11 17 112 ' 113 115 116 117 120 123 125 127 129 X31 134 % Weight Rosa % . Calcium <0 .2% 3.0% <0 . 2% 4.2% 6 .0% ' 4.6% 6 .0% 1 1 .2% 1.4% 22.4% 9.0% . 3.6% 3.6% 92.2% ' <0 .2% <0 .2% ' <0 .2% 1 .0% ' <0 .2% 2 .0 . <0 .2% <0 .2 <0 .2% <0 .2% . <0 .2% . <0 .2 8 ' . <0 .2% >20 .0 . CARBONATE SPKrT-vpMg % Magnesium <0 .2 % . <0 .2% <0.2 % 0.4% 0.4% 0.4% <0 .2% ' I <0 .2 % <0 .2 % . <0 .2% <0 .2 % <0 .2 % . <0 .2% <0 .2% -- Specimen No. 14 16 111 114 118 119 121 122 130 135 137 % Weight Loss ' 2 2 .8% 43.0% 2 1 .6% 44.2% 75.2% 37.81 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% 1.3% 6 .6% 4.4%` TAXC SPECIMttM-Q . 8 Magnesium 1 .1 % 1.15% 6.4% 5.0% 24.0% 4.0% 8.0% ' 15,2% 1 .6% 13.4% . 24.0% ---- ~ Specimen NO. % Weight Loss 12 3.6% 13 1.6% - 15 . 5.4% IS" . 6.0% 19 . <0.2% Ilo 4.2% 124 8.0% 126 . <0.2% 128 1 12.6% 132 i 1.2% 133 5.6% 13 6 ' 4.6% ' . % calcium % Magnesium . <0.2% 0.4% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0.2% <0,2% <0.2% <0.2% 0.4% 0.34% <0.2% . <0.2% | <0.2% /Continued,.., J&J-00S0S93 FITZGERALD00077 51 TALC SPECIMENS [Continued) Specimen No. 138 139 140 141 142 143 144 145 % Weight Lose % Calcium 1 .0% <0 *2% 7*0% . <0 .2 % 0 .8 % 6 .2 % . . <0 .2% 8 .0% . <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% t J&J-0060694 F1TZGERALD00078 : l I t I I . } ; ,1 . T f Electron Microscope Examination of Italian Mine Samples and Imported Satch Shipments of Italian Powder The wain, purpose of the electron microscope examination ox mine samples and also representative fractions of the kalian 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 ten microns in size. It has been used in this investi- 92" " 3^erefore to examina only the finer particulate portion ox the Italian samples. It may be argued that only a small traction 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 b y 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 Amosite, Crocidolite, Anthophyllite and Chrysotile asbestos. ' Also Figs. E-F have been inserted to demonstrate typical single particle electron ^ ffraction 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 o 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, B.M.6. electron microscope and examined for particles resemb ling commercial asbestos fibres. Where suitable particles were observed) selected area electron diffraction patterns were 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-0060S95 FITZGERALD00079 53 Particle Morphology 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 whatso ever 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 parti cles 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-hand 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 were very distorted and in no w a y matched typical chrysotile or amphibole patterns. J&J-0060696 FITZGERALD00080 T h e only group of specimens in which, amphibole fibres were confirmed were in those specimens with known amphibole composItion. However, even t h e fibres found, in these speci mens barely resembled the fibres formed by the commercial amphibole asbestos minerals. To assess the particles produced from t he pure amphibole mineral CTremolite],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 thse fibres were similar to those obtained from the commercial amphibole minerals, although they were more difficult to obtain because of the greater thickness of t h e s e particles. Other specimens in. the group, w hich did not contain, talc but were composed of sheet silicate minerals m a i n l y muscovite, "were also practically free of fibrous parti cles. There appeared to b e no general tendency for these other minerals to form fine fibrous particles. & number of very fine short fibres ware 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 copias 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 w i t h impurities of carbonate and chlorite. ChJ R o c k type specimens, i.e. footwall limestone etc. Cc) T hose specimens composed m a in l y of carbonates. Cdl A mp hi b ol e specimens w i t h 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 wer e characterised by the compact nature of the particles with, evenly distributed fibres end very few translucent plates. The groups of particles described are illustrated by the foll 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 be 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 gnrai 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. ... i J&J-OOS0698 F1TZGERALD00082 se. Examples of Commercial Amphibole' and Chrysofcile asbestos particles together with, typical selected area electron diffraction patterns. Anthophylllte asbestos particles 3000 J8.J-0060699 FITZGERALD00083 Amosite asbestos particles x 3000 Croeidolite asbestos particles x 3000 J&J-0060700 FITZGERALD00084 5a m p M h o l e asbestos selected area electron diffraction pattern. Chrvsotia asbestos selected area electron, diffraction p attern . J&J-0060701 PITZGERALD00085 Electron micrographs of particles produced from specimens which h a v e be e n classified as rock. types* . \ J&J-0060702 FITZGERALD00086 60 - Pig- 1 . Specimen I13 seam 'inclusion showing passage ' . into talc x 3000. T h e particles are mainly compact and electron dense. A few flakes# no fibres present Fig, 2 , i Speci men I1 5 . Talc footwall Comp ac t particles with, a few No fibres present. contact.- x 3000. small flakes. J&J -0060703 FIT2GERALD00087 vl^ 3 Specimen Ii6- Lithological inclusion from Face 1. x 3000. Compact electron dense particles. Wo fibres present.- Fig. 4 t Specimen I1 7 . Footwall.rock sample, .x 3000, Mainly compact particles produced with a few plate like forms, ' J&J-OQE0704 FITZGERALD00088 62 * ? r_5 Specimen 123- Black gneiss, 2ft below talc _ seam, x 3CX)0 . Compact electron dense ` particles produced. HilL--Ji. Specimen 125, Pootwall limestone- x 3000, . Compact electron dense particles. J&J-0060705 F1TZGERALD00089 63 ff1 ? - 1 ` Specimen 127. Lithological inclusion face 1. x 3000. Platey electron dense particles. Ho fibres, 719 8. Specimen 129. Sample 6 Footwall, x 3000 Compact electron dense particles with, a few ' olate-like forms. J&J-0060706 FIT2GERALD00090 64 Specimen I 3 1 . Black inclusion .face 1. x 3000' A mixture of plate-like and compact forms mainly electron dense in character. Fig.10. specimen I 34. 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 o carbonate minerals y i J&J-0060708 FITZGERALD00092 66 Sk-Vv f z1" ft B * -*? y^it^i-fx-FL '"- r ,- u * * '* s T ] ^ *& % >,W*V;. f ` r C - , , : K - J w ?.* ~; .:* * ^ H ^,,.tf*. ': r. > r` ' V-.U*,,.r .... W - j V < W iij ... .: .*SL f&'zi, V .*.-; ^ ` ` * r - Fig. 1 . Specimen I n CarBonate inclusion with, some' talc, x 3000. Particles consist of a mixture of compact and plate-like forms. ^5* 2 ' i S??5i'lnerl *14 Inclusion in talc seam Face 4, middle of seam, x 3000. Granular particles With plate-like types and lath-like form3 . J&J-0060709 FITZGERALD00093 67 Flg^_3. Specimen I^g. Carbonate/talc sample, x 3000. r e t i c l e s compact and electron dense. A few plate-like forms. i - ^ 3 :-- i- Specimen X 2I. Inclusion from Face 2 . .x 3000. This specimen produced plate-like and compact particles with, so m e lath-like forma. J&J-0060710 F1TZGERAL D00094 gig.- 7 Specimen I2G> Coloured talc inclusions, 3i 3000. The particles produced from the various coloured inclusions in the talc were found to be mainly plate-like with a few lath forms. . gig. 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 FITZGERALD00100 14 gig, 9 Specimen 1 3 2 - Pace 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. lath, forms. J&J-0060717 FITZGERALDO0101 Fig.' -il. Specimen I 38. Pyrite/Talc specimen, x 3000. Blate-like p a r t i e s with, some rolled tabes of talc. . ' Flu. 12 Specimen 139. 5" - 0 coloured pieces from the crusher, x 3000. These various coloured talc pieces produced only plate-like particles. J&J.Q06Q718 FITZGERALD00102 Flo.. 13 Specimen 141 Face 2, good talc speoii Flafce-like particles together with roi: sheets lath forms and textile type fifai Fie. 1 4 . Specimen 142 Face 1, green coloured t This C9 loured specimen produced plate.-1 cles which, were rather mor e electron de: J&J-0060719 F1TZGERALD00103 Fig. 15. Specimen 1 4 3 . Face 10. Fibrous looking hand 'specimen, x 3000. This sample was found to be practically all plate-like in form. Fig. 16 Specimen I4 4 . F a c e 1. Pure talc sample, x3000. Plate-like particles w i t h some lath-like forms. J&J-0060720 FITZGERALD00104 78 Fig' 17 Specimen 145 Face 1. Good talc specimen, ' x 3000. A mixture of plate-like particles and fibrous forms, including rolled tubes and textile type fibres. lath like forms, together with a typical textile form, which can be seen to have a sheet-like form ' J&J-0060721 FITZGERALD00105 n Electron. Micrographs of particles produced1 from . those specimens containing amphibole mineral and also from the amphibole mineral itself. i i J&J-O060722 FITZGERALD00106 ov Fio. 1* Specimen Iig. Tremolite/carbonate talc -- " sample x 3000. Compact particles,a few lath, forms present. Fi<r. 2. Specimen 120. Amphibole sample from Galana .-- " level 1212. x 3000. Compact particles with numerous lath forms. J&J-0060723 F1TZGERALD00107 Figs, 3 and 4 ParticJ.es produced from single crystals of - tremolxte extracted from specimens I19 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 505 of the particles were elongated in shape J&J-0060724 FITZGERALD00108 82 gigs. 5- and 6 ' . Selected area electron diffraction patterns obtained from amphibole particles found in ` specimens and I2o J&J-0Q60725 F1TZGERALD00109 83 gig 7 . Typical selected area diffraction pattern obtained from talc plates. t Fig. 8 . Selected area diffraction pattern obtained from a typical textile type fibre showing features of a rotated or coiled structure. J&J-0060726 FITZGERALD00110 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! .. ' tii 'Rock* Type til) 'Talc' Type ' (liil *Carbonate' Type A l l 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 A STM index and this comparison illustrates the need to prepare standards for a particular locality from specimens at that locality. ' T h e samples were compared with, these standards b y 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 tha larger samples a section was cut from the middle to be a representative sample, for the smaller samples as m a n y 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 - r a y analysis, w e r e further ground (to less than 300 mesh} in a-small agate ball mill and then sieved through a 350 m e s h screen (and stored in plastic bags. . The grinding wills 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 FITZGERALD00111 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 m m 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 he mounted in the Debye-Scherrer cameras. ' In-the cameras Ilford Industrial fG* X--ray film was used. The film was processed using Kodak DX-80 developer and Ilford HypaiiT 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 fd' spacings can he calcu lated. * STANDARD PATTERNS When all the samples X-ray photographs had been measured and the idi 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 m 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 w i t h themselves to check t'nat 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 daft to varying iron corftent and this can easily be seen on h-a. X-ray films as it causes fluorescence with copper radiation and blackens the X-ray film generally. J&J-0060728 F1TZGERALD00112 86 RESULTS For the analysis of the results the samples have been divided into five sections . (i) standard patterns ' ` (ill' sample patterns (rock type) . (iiij sample patte r n s (.carbonate type} Civ) sample patterns Ctalc type) Cv> batch sample patterns (.includes old powders and . shipments). ` Two methods were used to find the mineral present in fbo sample. One method uses a computer program to detect the mineral. In method the bragg angles of samples were compared with, 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 tfere first sorted ipto 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 could 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 hut could not place them in the correct order. t J&J-0060729 FITZGERALD00113 97 Patterns used as standards from the Italian mine samples and their comparison with. A.S.P.M, data and against themselves. J&J-006D730 F1TZGERALD00114 ;-..r -'Comparison against: A.S.T-M.- Lnclext -1 line, uniafccZit 1*1145 < Patterns not Included: S-263 Muscovite -2M1, 7-25 . }. i Muscovite (1M), 7-32 Muscovite (2M1), 7-76 Ripidolite (Chlorits), 7 - 7 8 -Thurfcngite (Chlorite), 7-166 Bavalite (Chlorite) , 10-183 Peainnite Chlorite , 11-78 Dolomite, ) B and T Quart2 .. ! j- Most probable minerals present: Talc Muscovite Calcite Comparison against Italian Standards i ' Patterns not included; Chlorite (142), Chlorite (14), Muscovite (135), Magnesite (16) Tremolita (119/120), Dolomit .Most probable Minerals p r e se n t ; Talc I i Visual comparison Minerals detected Talc, Calcite * Talc, Calcite SAMPLE SIP 2 TALC pvrrry ' S*Y : I' \V\\ :.*.*t Is.I * .J' .^. $ om Comparison against A..S.T.M, index; 2 lines unmatched, 1.1159. i 1.1353# i Patterns not Included; 7-76 Rlpodolite (Chlorite), i 7-73/Thuringitfe (Chlorite), 7-166 Bavalite (Chlorite). Most probable minerals present; Talc, Muscovite, Calcite Comparison against Italian Standards ' _ Patterns not included; Chlorite (142), Chlorite (.14), ' " ' Tremolite (119/120). ' Most probable minerals present? Talc, Muscovite, Magnesite. Visual Comparison ' Talc, Chlorite, Magnesite 'Minerals Petected Talc, ChloriteV'Magnestie J8.J-0060731 FITZGERALD00115 SAMPLE SIP 3 CHLORITE Comparison against A.S.T.M. index; 2 lines unmatched, 1.1739#, . 1,29 A Patterns not included; 6-253 Muscovite ~2M1, 7-25 Muscovite (IMJ 7-32 Muscovite (2M1), 7-79 Forstarite COlivlne), 8-479 Magnesite Most probable minerals present; Chlorite, Talc . Comparison against Italian Standards Patterns not Incl u ded ; Muscovite (135), Tremollte (119 and 120) Most probable minerals present: C h lorite, Talc. 'visual Comparison Chlorite, Talc ' 'Minerals Present . Chlori t e ,' Talc ' ' SAMPLE SXP 4 CHLORITE Comparison against A.S.T.M. index: 3 lines unmatched , Patterns not (2M1), 8-479 ` \ included: Magnesite, 1.1741A, 1.1318A, 1.0984?. , 6-263 Muscovite -- 2M1, 7-- 32 Muscovite 11-- 78 Dolomite, 13-- 437 Boric Acid. Most probable minerals presents Chlorite, Talc Comparison against Italian Standards . Patterns n ot included: Calcitu (.134)', Magnesite '(137) , Muscovite (135) , Trentolite (119/120) , Dolomite. Most probable mineral present: Chlorite, Talc Visual Comparison 1 Chlorite, Talc ' . Minerals Present Chlorite, Talc J&J-0060732 FITZGERALD00116 SAMPLE SIP 5 TALC Comparison against' index: ' Patterns not included: 5-586 Calcite, 7-25 Muscovite (IM), 7-77 Sheridanite (Chlorite), 7-79 Forsterite(Olivine), 7-166 Bavalite (Chlorite). . Most probable minerals present; .Talc. Muscovite, Chlorite 1 Comparison against Italian Standards . ' Patterns not included: Chlorite (142), Chlorite (14), Magnesite(16), Tremolite (119/120), '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 acrainst Italian Standards ' patterns not included; Magnesite (137), Tremolite (119 and 120) . . Dolomite ' Most probable minerals present: Muscovite, Talc Visual Comparison Muscovite, Calcite Mineral Present Muscovite, calcite J&J-0060733 FITZGERALD00117 SftMPLB SIP 7 MAGNESITR Comparison against A .S,T.M. i n dext 1 line unmatched 1.1092A M t e n s not included: 5-586 Calcite, 6-263 Muscovite -2M1, 7-25 Muscovite Cli-il, 7-32 Muscovite (2M1), 7-160 Chlorite (Kotshubeite), 7-76 Ripodolite (Chlorite), 7-7a Thurincite (Chlorite), 7-166 Bavalite (Chlorite), 10-183 Parminite Chlorite, 13-- 437 Tremolite. Most probable minerals present: Magnesite, Dolomite, Talc 'Comparison against Italian Standards Patterns not included: Calcite (134.), Chlorite (14) Muscovite (1351, Tremolite (I19/X20). Most probable' minerals present; Magnesite, Dolomite, Talc Visual Comparison Magnesite, Talc , Minerals Present Talc, Magnesite. SAMPBD SIP 8 TREMOUTS Patterns not included: 6-263 Muscovite -2M1, 7-25 Muscovite (IM1, 7-32 Muscovite (2M1), 7-42 Muscovite (3T), 7-79 Porster- ite (Olivine). Most probable minerals present: Tremolite, Talc, Calcite 'Comparison against Italian Standards ' Patterns not incl ud e d Magnesite (137), Chlorite (14), Muscovite (135). . Most probable minerals present: Tremolite, Talc, Calcite Visual Comparison1 Tremolite, Talc Minerals Present Tremolite, Talc J&J-0060734 FITZGERALD00118 ->.<nc. ali? 'i D O L O M I T E Patterns not Included! 3-881 Tale, 6-263 Muscovite -2M1, 7-25 Muscovite (IK), 7-32 Muscovite t2Ml), 15-814 Muscovite 2M1 CVanadian], 7-160 Chlorite {Xotsehubeite), 7-79 ForsterItfe (Olivine), 13-437 Tremolite, 19-770 Talc. Most probable minerals present; Dolomite, Muscovite . 'Comparison against Italian Standards ' Patterns not Included: Magnesite (137), Chlorite (14) Tremolite (119/120). Most probable minerals presentt Dolomite, Talc 'Visual Comparison . ' Dolomite, Muscovite, Calcite . Minerals Present Dolomite, Muscovite, Calcit SAMPLE SIP 10 CALCITS Patterns not 'included; 7-160 Chlorite (Kotschubelte), 7-79 Forsterite.(Olivine), 13-437 Tremolite. . Most probable minerls present; Calcite, -Muscovite Comparison against Italian Standards ' .Patterns n ot included; Magnesite (IS), Tremolite (119-120), 'Most probable minerals present; Calcite, Muscovite ' 'Visual Comparison Calcite i . Minerals .Present Calcite, Muscovite J&J-0060735 F1TZGERALD00119 93 SAMPLE SIP 11 MAGNESITE ^trnn* VTit1 vi*;*',-*\ * Vi Comparison against fl.S.T.M. Index: 1 unmatched line 1.1085A Patterns n o t included! 5-- 586 Calcite, 7-25 Muscovite (IM) , 7-160 Chlorite (Kotschubeite), 7-75 Ripidolita (Chlorite), 7-7 B Thuringifce (chlorite)., 7-166 Bhvalite (Chlorite) , 10-L83 Pennlnite Chlorite, B s T .Quartz. Most probable minerals presents Magnesite, Dolomite, Talc .Comparison against the Italian Standards Patterns not included! Calotte (T34), Chlorite (XI), 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 o Patterns Obtained from R o c k Type Specimens and Their Major Mineral Content from X-Ray Comparison. . i J&J-0060737 FITZGERALD00121 SAMPLE Tl TALC FROM POOOTMJ.' CONTACT Comparison - Patterns not included: Magnesite (137), Tremolite (119/120). Mos t probable minerals present: Chlorite,. Muscovite, Talc, _ . .Dolomite. Visual Comparison: Talc Chlorite, Calcite Minerals Present: ' Talc Chlorite, Calcite. SAMPLE 17 MICA SCHIST . Comparison Patterns not Included: Magnesite CI3?)i Talc (145), "7--------------------- Tremolite. (119/120). Most probable minerals present; Muscovite, Talc, Quartz ' Visual Comparison; Muscovite, Talc,Quartz . Minerals Present; SAMPLE X12 POQTHRLL SAMPLE? AMPHIBOLITE a O 'Comparisont 3 lines unmatched. 6.4653A 1.2819A o 1.225A Patterns not included: ' Calcite (134), Magnesite (137), Talc (146), Talc (15), Tremolite (119/120). Most probable minerals present; Muscovite, Dolomite, Quart2 . Visual' C om parison; Muscovite, Chlorite, Quartz Minerals present; J&J-0060738 FITZGERALD00122 SAMPLE 113 I^CLDSIOM SHOtTpIG PASSAGE INTO TALC hQTTQM TRANSIT P a tt e rn s n o t I nc l u d e d : Magnesite (137), Muscovite (135), . . Treraolite {119/120}, Dolomite Most probable minerals present: Chlorite, Talc, Quartz Visual Comparison: Chlorite. Muscovite, Quartz ' Minerals Present: Chlorite, Muscovite, quartz SAMPLE X15 TALC-FOOTWALL CONTACT Comparison: ' Patterns n o t i nc l u d e d ; 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 F1TZGERALD00123 97 SAMPLE 116 FACE 1 INCLUSION BELOW SEAM ' Comparison ' ' Patterns not included t Talc {.145), Tremollte {.H9/I201 ----------------- " '" Dolomite Most probable minerals present: Muscovite, Chlorite, ----- ;----- --------------- ~ Calcite, Quart* . . Visual Comparison; Chlorite, Muscovite, Calcite, Quarts Minerals Present Chlorite, Muscovite, Calcite, Quartz SAMPLE 117 POOTWALL KOCK SAMPLE PAffftrns not included: Talc (X46), Chlorite ( 1 4 2 ) ^ ,, ,, Muscovite (135), Magnesite (16), Tremolita (119/120), Dolomite. Most probable minerals present: Calcite, Talc, Quartz visual Comparison: Calcite, Talc, Quartz - Minerals Presenti ' z> -- Calcite, Talc, Quar t z . J&J-OD60740 FITZGERALD00124 SAMPLE X20 AMPHIBOLY SAMPLE FRO GUIANA LEVEL 1212 . I "* r : 1 * patterns not included: Chlorite (142), Chlorite (14), Muscovite (135)r Magnesite (16), Dolomite. . Most probable minerals -present; T a l c , Tremolite, Calcite, Magnesite. . ' Visual Comparison: Talc, Tremolite, Chlorite Minerals Present; Talc, Chlorite, Tremolite SAMPLE 123 BLACK GNEISS . -- 7f*r TV, :- ; ___ , ^ ... i v 4: J A..^ .:XOj.-V.'1**- -Cw m,i * liih-X > A-'--^ ' ' ' .- Comparisons 5 unmatched lines 6.3586/?, 1.449A, 1.2278A, 1.2121A, 1.1520/1. Patterns not included: Calcite (,134), Tremolite (119/120) Most probable minerals present Muscovite, Talc, Magnesite, Quartz . . Visual Comparisons Muscovite, Magnesite, Quartz ' ; H u e r a i s Present: Muscovite, Magnesite, Quartz i J&J-0060741 FITZGERALD00125 99 SAMPLE 125 LIMBSTfittE FnOTWaT.T, ' Comparison Patterns not I nc l u d e d : Calcite (134),, Tremolite (II9/ 120 ),, Most probable minerals present; gale. Chlorite, Quartz Visual Comparison; Talc, Magnesite, Quartz ` "Minerals Present: Talc, Magnesite, Quartz ` SAMPLE 27 LITHOLOGICAL INCLUSION . ' Comparison Patterns not included; ~ . Chlorite (142), Chlorite (14), Tremolite (119/120), Magnesite Dolomite ' (16), ` Most' probable mine r a ls present: T a l c , Calcite, Quartz . Visual Comparison: Talc, Calcite, Quartz Minerals Present; T a l c . Calcite, Quartz ' SAMPLE 129 SAMPLE 6 PQOTH&LL Comparison; 2 unmatched lines O o 1.1526&, 6.3031A . . Patterns not i n c l u d e d ; Calcite (134), Magnesite (13?), Chlorite (14), Talc CI5). Most probable minerals uresent: Muscovite, Quart2 , Dolomite, Talc Visual Comparison; Muscovite, Q u a r t z . Minerals Present; 'Muscovite. Quartz ' J&J-0060742 FITZGERALD00126 SAMPLE 131 BLACK INCLUSION ' P atterns not Included; Magnesite (137), Talc :(I5},Dolomite' 'Most- probable minerals p r e s e n t ; ' M u sc o v i t e , Calcite, Talc 'Visual'' Comp ar i so n: 'M u s c o v i t e , Calcite 'Minerals Present: Muscovite, Calcite . 'sftMPLE 134 TOKHBI. W A L L - M A R B L E Comparison * ' Patterns not included; Tremolite {119/120}, Magnesite U 6 ) Most probable minerals present; Calclts, Muscovite, T a l o 'Visual Comparison, Calcite . Minerals Present Calcite ' ' / t A . J&J-0060743 FITZGERALD00127 101 Examples.of Patterns Obtained from the Carbonate Specimens and their Major Mineral Compo sition Obtained from Comparison with. Standards. i 4 J&J-0060744 FITZGERALD00128 106 3 M g g - a i _ H fiSSlVE CASBOIBTE. BID Or ,,n.rr, 'Comparison: . . S B g "s t tm o llt (Ia 9 /I2 0 ) a SE proOaBle a a . pres e t M uscovite^ M ag nesite. Chlorite r '-- " al c moari,son: M a gn e s i te . Talc, Chlorite ^ S e r ais P re se nt: Magnesite, Talc, Chlorite . SAMPLE 1 3 7 CARBONATE AMD TflT^ *WA4*c lJ.J4) f Ui M uscovite (1 3 5 ). p w a t, g oesite. D o i o m t a , T U O Visual Comparison: Magnesite.. Talc . ' Is. Present; Magnesite, Talc 1 J&J-0060749 FITZGERALD00133 107 Examples of Patterns and Major Mineral content of Those Specimens Classified a s Tale Types Obtained by Comparison, i J&J-0060750 FITZGERALD00134 SAMPLE 12 SORTING PEBCES Comparison Patterns not included: Tremollte CI19/120). Most probable minerals present; Chlorite, Magnesite, Talc Visual Comparison! Chlorite, Talc ' M in e ra ls P re s e n t; C h lo r ite , T a lc ' ' \ SAMPLE 13 COLOURED TALC Comparison; . , Patterns not- included: Chlorite (142), Chlorite (14), Muscovite (X35)4 Magnesite (X)r Trsmolite (X19/X20J # Dolomite* Most probable minerals present: Talc V isual C om parison;i * Minerals pre s en t : Talc Talc ' . ' t . ' J&J-O060751 F1TZGERALD00135 109 SAMPLE I5 GENERAL ORE Comparison: 2 unmatched line3 o 18.1157A o 7.0073A ' Patterns n ot i n c l u d e d ? Chlorite (142), C h l o ri t e (14), . Muscovite (135), Dolomite. Most probable minerals present: Talc, Magnesite Visual Comparison; Tale M-tp-rals p r e s e n t ; Talc SAMPLE 18 MASSIVE TALC Patterns not inclu d e d ; Magnesite (16)/ Tremolite (119/120) Most probable minerals present: Talc, Chlorite , - Visual Comparison; ! Minerals Present; , .Talc, Chlorite Talc, Chlorite J&J-O060762 FITZGERALD00136 110 comparison Patterns not i n c l u d e d : C a l cL t e (.134), Magnesite Cl37), Musco vi t e {.135} , M ag ne s i te CI6 ) , T r em olite (119/120).. Mo s t probable minerals p r e s e n t : Talc, C hlorite . Visible Comparison: Talc, Chlorite ; th^t-^.ls Presents Talc, Chlorite SAMPLE IIP GRAHUIAR TALC ' ' Comparison . , not included-. C a l c i t e CI34), M a gn e s i te Cl37) , ~ " -- ---------- ---- C h l o r i t e (142) Chlorite CI4), M u s c o v i t e (135), Magnesite (16) Tremolite (H9/I20) Most probable minerals present: Talc, Dolomite Visible Comparison; Talc, Dolomite - Minerals Present: Talc, Dolomite J&J-0060753 FITZGERALD00137 Ill SAMPLE 124 TALC PAPE 2 Comparison: " Patterns not Included: M uscovite (135), Magnesite (16) , T r e n d i t e (119/ 120) / 1 M ost p r o b a b le m in e ra lg p r e s e n t ': T a l c , Chlorite, Dolomite, Magnesite Visual Comparison; 'D o l o m i t e . Magnesite, Talc Minerals Present.- Dolomite. Magnesite, Talc SAMPLE 126 r- TALC INCLUSIONS `V.l-- 11 *8f - f 4 : -xA w V a & Comparison P atterns not includgd: Calcite (134), Tremolite (I19/X20) - ?'?t > robable minerals present? Talc, C h l o r i t e , Dolomite Visual Comparison: T a l c ,' Chlorite ' Minerals Present: * Talc, Chlorite J&J-0060754 FITZGERALD00138 112 SAMPLE 128 QUARTZ TALC Patterns not Inc l u d e d : Muscovite (135), Tremollte (119/120) Magnesite 116), Dolomite Most probable minerals present: Chlorite, Talc# Quartz Visual Comparisonr Chlorite, TaLc,Quartz . Minerals Present: Chlorite, Talc, Quartz . SAMPLE 132 OCCLUSION FACE 2 ~:\~r C o m p ariso n . v l : i \.vr \ V V : .< i m - i p ^ ; '?/j tu... .......h..!...:....:. Patterns not Includedt Muscovite (135), Tremollte (I19/I20J ^ Dolomite Most probable minerals present; Chlorite, Talc, Magnesite Visual Comparison: Minerals Present; l. Chlorite, Talc Chlorite, Talc J&J-0060755 FITZGERALD00139 113 SAMPLE 133 TALC END QF WORKING f '' I Comparisonr . . m \ it ' -.'it V.* . W Z- j - t : U m tot _ Patterns not included: Muscovite CI35), Tremalite [X19/I20) Most probable minerals present; Talc, Chlorite, Magnesite . Dolomite Visual.Comparison: Talc, Chlorite, Magnesite ' 'Minerals Present: Tale, Chlorite, Magnesite SAMPLE 136 GREY TALC 'Comparison: 2 unmatched lines 1.2204A 1.1517a Patterns not i n c l u d e d : Calcite (134),, Talc CI46) ' . 'Tremolite 119/120). M -st P rotiat>le m i n erals present: C h l o r i t e .- Muscovite, Tal c 'Visual Comparison: Chlorite, Talc Minerals Present: Chlorite, Talc . ` SAMPLE 138 TALC AMD PYRXTE ' . ' Comparison: 1 unmatched line 1.041A Patterns not included: Chlo r i te 142), Chlorite 1 4 ),. Muscovite (135), Tremolite 119/120) Most probable minerals present: Talc. Calcite Visual Comparison; 1 Talc, Calcite Minerals Present: ' Talc, Calcite ' . J&J-006075S FITZGERALDD0140 SAMPLE 139 S- 'Q* FROM CRUSHER Patterns not included: Muscovite, (135), Tremolite (119/120) Magnesite (16). Most probable minerals present: Talc Chlorite Visual Comparison: Talc, Chlorite, Calcite 'Minerals Presentt Talc, Chlorite, Calcite . .SAMPLE 140 PIATEY TALC Comparison: ' Patterns not included: Tremolite (119/120) -- 5fc Prbable minerals present; Talc, Magnesite, Chlorite 'Visual Comparison; . Talc, Chlorite,, Magnesite ' 'G e r a i s Present, Talc, Chlorite,. Magnesite SAMPLE 141 GOOD SPECIMEN Ho.2. 'C o m p a r i s o n ; Patterns not included ' . . Calcite (134)', Muscovite (1 3 5 ), ' Tremolite (119/120), Magnesite (16), Dolomite Most probable minerals present; Talc, Chlorite `Visual Comparison; Talc, Chlorite . Minerals P r esent; ?alc, Chlorite J&J-0060757 FITZGERALD00141 US SAMPLE 142 COLOURED TALC Wo.1 Patterns not Included: Magnesite (237), laic (14$). Muscovite' CI35), Dolomite. . . `Host probable minerals present: Chlorite, Talc . ' ' Visual, C om p a r i s o n : dhlorite, Talc ' Minerals Present: 'Chlorite, Tala ' ' ' ' S A M P L E X 4 3 F I B R O U S T A L C FACE 10 Comparison: '2 unmatched lines 4.8928A, 4.4431a Patterns, not included: . Calcite (234), Magnesite (237), Muscovite (135), Treiaolite ( U9/X20) Most probable minerals Present: Chlorite, Talc Visual' Comp ar i so n; ' c h l o r i t e . Talc , , Minerals Present Chlorite, Talc I J&J-0Q60758 FITZGERALD00142 SfttffEE X44 ' PURE TALC FACE 1 Comparison: 1 unmatched line 1.079B Pa tterns n o t l n d u d e d; Magnesite (137), Tale (142),' ' .Muscovite CI35), Tremllta (1 1 9 / 12 0 ) M ost probable minerals present: Chlorite. Talc, Dolomite 'Visual Comparison: Talc, Magnesite, Chlorite " ' Minerals Present: Talc, Magnesite, Chlorite : ' ` SAMPLE 145 ' GOOD SPECIMEN FACE 1 t**1 * T i1Tr:- T* .... `. . . i. m7. `1..^. _. . \ m ... } >. . ..)I V.w Comparison; 2 unmatched lines 1.0882A, 1.0505A ...i ft. S S L s is S ^ y g g i ',, 3 2 3 ^ 1141 probable minerals present: Talc,'Magnesite Visual' C omp a r i s o n ; Talc -. . . . Minerals Present: Ta'lc ' ' ' SAMPLE 146 COLOURED TALC FACE 3 Comparison: Paitaras not included: Chlorite (142), Chlorite (14) . , (135), Tremolite (119/120), Most.probable minoris prcssnt: Tale, Magnesita Muscovite Visual Comtaarison - Tale, Magnesite . . . Minerals present: Talc, Magnesite J&J-O060759 FITZGERALD00143 117 Specimen Patterns and Comparison Data for Samples of Old Powders and 00000 Shipments \ J&J-0060760 FITZGERALD00144 118 B A T C H 6 P O W D E R F I PHr.J. 0 3 5 . Comparison^ l unmatched line 8.1972A ' ' P atterns not: included; Muscovite Cr35>, Tremolite (119/120) ~Most probable minerals' present; T a l e , Magnesite,-chlorite Visual Comparisons Talc, Chlorite, Magnesite ' . 'giaerals- Present; Talc, Chlorite, Magnesite ' ' S A M P L E B A T C H 8 P O W D E R (S and G) PW..T. 0 3 s' Patterns not incl u de d ? Magnesite (16)t Tremolite (119/120) ; ^-St i?robable m inerals presents Tale, Magnesite, Boric Acid ' Visual Comparison: Minerals .Present; Talc, Chlorite, Boric Acid Tale, Chlorite, Boric A c i d ' . - . J SAMPL'E BATCH 9 POWDER T4 P.W.J. 035 Compar i s o n t l unmatched line 1 . 2587A ` . ' Patterns not included;. Tremolite (I19/X20) " ' ' Most probab le ,minerals present: Tale, Chlorite, muscovite , Magnesite, Boric Acid Visual Comparison: Talc, Chlorite, Boric Acid ' ' Minerals Prasset. Talc, Chlorite, Boric Acid ' . J&J-0060761 FITZGERALD00145 119 1 SAMPEg B ATCH 1 0 POWDER SK1BP pw, J. 035 . Comparison ; ' Patterns not i n c l u d e d : Calcite (134), Muscovite (135) Tremolite (119/120), Dolomite ' Most probable minerals present: Talc, Chlorite, Magnesite Boric Acid, ' ' Visual .Comparisoni Talc, Chlorite, Boric Acid : : Minerals Present; Talc, Chlorite, Boric Acid ` ' SAMPLE B A T C H 11 P OWD E R LD18P PW..T. 035 Comparison.- 1 unmatched line 8.1363A P atterns not i n c l u d e d ; Magnesite (IS), Tremollte (II9/i20) Dolomite Most p ro b a b l e m i n erals p r e s e n t ; T a l c ', 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.- l unmatched line 8.12 A . Patterns not included; Tremolite CI19/I20) 'Mgs-fc p r o b a b l e m i n erals p r e s e n t : T a l c , muscovite, chlorite, ' . Boric Acid. - 'Visual Comparison^ Talc, Chlorite, Boric Acid, Magnesite ( * . Minerals Present; .Talc, Chlorite, Boric Acid, Magnesite J&J-00607S2 F1TZGERALD00146 120 ' t SAMPLE BATCH 13 TALC 1961 PU.J. 02g ' Comparison - ' Patterns not I n c l u d e d ; Calcite (.134), Muscovite (135) . . Tremolite CI19/I201 1 ` 'Most probable minerals present: Talc, Chlorite, Magnesite . * * Boric Acid ' . 'Visual Comparison> Talc, Chlorite, Magnesite, Boric Acid ' Minerals' Present: Talc, Chlorite, Magnesite, Boric Acid SAMPLE B A T C H 19 r _r . i. S.S. ' ' I :) . iV u V `-i\ i . CATHERXttA W. --------- TM 02/05/72 . % V m .: f V i! k m t'\-r ' ') ' >i !/>' ! ! K .-u. I i*x'tLilt**** Comparison ' Patterns not included Tremolite (118/120) ' Most probable minerals present: Talc, Chlorite, Magnesite Visual Comparison: Talc, Chlorite, Magnesite ' Minerals Present: Talc, Chlorite, Magnesite SAMPLE BATCH 2 Comparison TALC S.S, EDNA 'B* 14/02/72 'Patterns -hot I n c l u d e d ; Talc ( 1 4 5 ) , Tremolite (X 19/X 20) 'Most probable minerals present? Talc, Chlorite `Visual Comparisons Talc, Chlorite . . Minerals Present: 1 Talc, Chlorite J&J-0060763 FITZGERALD00147 121 !{ CONCLUSIONS i i^T-rro^ Ptical examination has shown that there are a large number of mxnerals associated with the S T I Z ? * <*? 1 = . a n d I f t S " SS T h e footwall rocks in contact w i t h the talc are ma-fni., ' G a r n e t 63 5 ^ mi n e r a l s S11**2 ' muscovite, c h l o r i t e ? 'S i i t f 4 BSr car^onate material both calcite and -J M i no r minerals in the footwall contact rocks e p i ? ? te> microcline, tremolite and actinllite sphene, rutile, hornblende, rare talc, biotite nvrifi' ^ S i c ^ a v f e S i ? 0^ ^ 0 *. <R 0 C k tYPe into but with r " Positions to the footwall rocks m S c o i l t e hf= muscovite and chlorite contents. The StlTtiS y T 1X011 rich variety tphengite) , forms of chlorite were observed namely sherid- ^ t e and p e n n m i t e . other talc inclusions consist T O ^ l n c fCaf ^ ate miI,erals' calcite and magnesite in antitles. It is with these nodules that some tremolite is found. The rocks further away Iron Ihl and^ , I! fm S 1'-nainel? gneiss, become richer in quartz and microcline and below these marble occurs. sbowedht h ^ rt hoate fpecjjnens examined by optical means t ** carbonate minerals, calcite and magnes ite, were accompanied by talc, chlorite, tremolite JgeHnera2l ttnh.e/ cUtairb Bo n aa?t ed ?inYcrliutsei'on3s1 1 w e11r1emilnaorrgeamountvse.'ry In discrete in the talc seam itself. * 'u talc m n i PeCimenS examined, which can be classified as tile ^ . W -fe fOU? ? t 0 * e ln tile main composed of chlorite as the major contaminant. Some . Specimens, however, were predominantly composed of chlor- o i alc inciusions. Otter minerals f o m d in atiS a WlttL the talG sP aclmens included garnet, rutile and magnesite with rare tremolite and a quartz or t h ? t e i I niteIlfUSin ` . ^alc xsa} ' some differences were observed in the talc appearing to be a ? UriCy in texture. X-ray pictures of the clear murky material showed no differences however. T ^e powder X-ray examination confirmed the major occurrx?g ln the hand specimens and a classifiw as Possible into the three groups already m e n i** type s f carbonate samples and talc spec- T j S nl? asl^estos type mineral to be detected three Was ^ " oiite, which was found in . he specimens. The tremolite was associated itft. c ar bonate m in er a l s, namely magnesite and calcite, ChloIi?I?-te WI S detected in the talc type specimens, c-axorite was, hpwever, very common in the talc types. ome or tne specimens being very nearly pure chlorite in composition. There appeared to be some association of the chlorite with coloured talc specimens, especially those With a greyish colour. Other colour variations aue to rutile were not detected by X-ray examination. J&J-0060764 F1TZGERALD00148 * I C3 - - - O b B^ M SS f f ! S ranglng bacfc fco 1 3 i ^ w h i c h tbl o n l T b ?e rV a bl & difference was the presence- of. boric acid. ^ f1" - **ssTM. - ^ f i ^ f r s r a s s i ^ ' i a i s s - free oartieio? w^l produced compact fibre ?,, t ic le s" TflB talc specimens were, however, olate- D KC ticieSP P ea r?nj e y itfl quantities of lath, like particles coupled w i t h fibres which, were textile in appearance. Both lath and textile t S e s ol S t S l e s c S l asLstrtP?e^ mlnerals associated witi^tha commerc1 ," - * 1s^estos industry. Particles formed from the amphiboia mineral found at the mine were hardly fibrous Sf' ths-.ma-3ority of the tremolite b r L k i ^ g to j \ ? ,?act Paf t ic l e s - Those fibres formed ^ r T i h o r t . a n d h a d a v e r y large diameter when compared with, the varietles of ^bestos. S K E ^ K S * 1 " a s *" " " No amphiKie o ^ " * * - TM __ talc 00000 contains observable quantities o f chlorite aitd c ar b onate minerals and could contain anv mnc following minerals in very minor J S S ? muscovite, quartz, tremolite, garnet and rutile. if ^ ri^CTP ^ r o a ^ e f o f00tWa11 ? 0c!c were t0 contaminate the ore during production, several of the other listed minerals .specimens c o u id appear in the 1 Product. it is unlikely that they would be P reseilh m detectable amounts. P.D. 500LBY Project Supervisor t J&WJ660765 FITZGERALD00149 105 SAMPLE 122 MAGNESITE, DOLOMITE, TALC Coroparlson. ' Patterns not I nc l u d e d ; Calcite (134), Talc (145), Talc (146) Muscovite (135), Treroolite (I19/X20). Most probable minerals present; Dolomite, Magnesite, Chlorite, Talc. 'Visual Comparison: Talc, Dolomite. Minerals present; Talc, Dolomite , . SAMPLE 130 TALC AND OTHERS Comparison: . 'Patterns not included: Magnesite (137), Talc (15), Tremollte (I19/X20). Most probable minerals present: Dolomite, Chlorite, Muscovite, Talc. 1 Visual Comparison: Talc, Chlorite i Minerals Present:' Talc, Chlorite J&J-0060748 F1TZGERALD00132