Document 0LzGxeGXRKaQ0n2ZdOkwmB5yR

FILE NAME: RT Vanderbilt (RTV) DATE: 1971 Sept 9 DOC#: RTV150 DOCUMENT DESCRIPTION: Definitions Asbestos & Talc Minerals - Desert Minerals, Inc. DESBRT MINERALS, INC. DEFINITIONS ASBESTOS & TALC MINERALS Segregated September 9, 1971 Definitions from ''Industrial Minerals and Rocks"- Third Edition A.I.M.E. 1960 by Seeley W. Mudd Series. ASBESTOS (Pages 23 to 53) . Broad term for a number of fibrous mineral silicates, Incombustible and can be separated by mechanical means into fibres of various lengths and thicknesses but dlffiring in chemical and other properties. Six varieties: 1.. .CHRYSOTILE - finely fibrous form of serpentine, -- -- and five minerals of the AMPHIBOLE group: 2. AMOSITE - not fully recognized as a mineral but accepted in asbestos terminology. 3. ANTH0PHYLL1TE : 4. CROCIDOLITE ' 5. TREMOLITE 6. ACT1N0LITE . CHRYSOTILE . Chrysotile Is the result of hydrothermal reactions within the serpentine rock whether it be peridptite, dunite, pyroxenlte of serpentinized dolomltlc limestone. It is the most highly fibrous of asbestos minerals and is the grade moat generally used in asbestos cements, insulation, gaskets,' etc. None of the minerals from which asbeatos is,derived appear, to be among those associated with talc. The fibres may be easily separated and can be spun or woven, i CROCIDOLITE and AMOSITE Crocidolite and Amosite occur In metamorphosed siliceous-ferruginous, sediments, again not common with talc. ANTHOPZIYLLITE and TEEMOLITE Both ha.r a low Ignition loss. Anthophylllte is similar to tremolite except it is a magnesium, ferro silicate whereas tremolite is a calcium magnesium silicate. Anthophylllte has a laminar fibrous ''asbestiform" structure whereas tremolite consists of long, presmatlc and fibrous aggregates. Neither is possessed of fibres sufficiently flexible to be spun nor with tensile strength required to make them valuable in asbestos cements. Both are known to be present in some talcs or associated with them. CRMC-HT-TALC'000127 Ssk.;- S&r''- MINERALS, INC., BEFINTIONS ASBESTOS & TALC MINERALS,,Page 2, September 9, 1971 CHRYSOTILE Chryjotile constitutes about 93% of the current world production of asbestos, almost all of which Is derived from lost rocks which are ultrabaslc In composition, the balance being derived from serpentized dolomltic limestone. Approximately 5.4% of the world production is from amoaite and crocodolice. Tretnollte and anthophylllte account for only 1.6% of the world production, mostly for filler Use. Production of the Amphibole varieties of asbestos, other than amoaite and crocidolite is comparatively limited. In the United States the production of anthophyllite has bean on th decrease with principal production being in North Carolina. See attached tables for detailed types of asbestos. CONCLUSIONS Chrysotile Is almost entirely used for its fibre structure. . It is the most dangerous when breathed. Tremolite is an almost negligible type industrially. TALC and SOAPSTONE {Pages 835 to 850) Talc, the mineral, Is hydrous magnesium silicate, with a suggested theoretical formula H2Mg3(S103)4 or H20.3Mg0.4Si2, which postulates 63.5% S12, 31.7% MgO, and 4.8% H20. Industrial talcs do not approach above composition but are "mixtures of silicates that contain appreciable proportions of magnesia." Other minerals common in-industrial talc are serpentina, chlorites, TREMOLITE, ANTHQPHYLLITE, diopside, and quartz. The carbonates are also present -- calcite, dolomite, and magnesite. Some of these minerals have a pronounced effect on the properties of the talc. Some are highly desirable for. specific use. "An example of this type .Is the highly desirable tremolitlc 'talc* mined in New York state and California and ideally suited for use in_ some paints and ceramics." Much of this type of talc contains 50% or more of TREMOLITE.' .. ..... ..` STEATITE TALC ` Massive talc-rich material and refers to an especially pure talc that contains no more than 1,5% CaO, 1.5% combinedFeO and Fe20^. or 4% AIzO t . Pure r-- ,as a hardness of 1.0 to 1.5, la relatively inert and remains undecom posed in couv-flct with acids Most talc and soapstone deposits occur in altered ultrabaslc igneous rocks and in metamorphosed dolomltic limestones. (Page 837 - Occurrence and Distribution). Most deposits are localized along shear and shatter.zones In a nearby static environment. On the other:hand, in the SILVER LAKE district of California and at GOUVERNEUR', New York zones of talc schist, intimately associated with massive bodies of treraolltlc rock appear to have been formed during strong rock deformation. C R M C - H T -TALC-000128 >V W ^.--;r DgSE&T MN8PALS, INC.i PgPINITIONS ASBESTOH & TALC MINERALS. Paga 3 September 9, 1971 TALC and dQAPaTOMS (continuad) . gsyacially productiva and high grad talc deposita formed by the alteration o magnsium carbonata sedimentary rocks, occur In Northern New York, Eastern California, and Montana. * Th New York deposits near Gouverneur, New York, conaiats of "fibrous talc" composed largely of tremolta. anthophylllte,- serpentine, and talc. In tha rgion o Southern Death Valley and the Kingston Mountains tal deposits ara composed of flpa-grainad tremollte and the mineral talc in both foliated and massive varieties, Talc deposita in the Myo Mountains of California and the Palmetto-Oaala district in Western Nevada ara of steatite and "near-steatite''variety. Similar talcs are also produced in various sections of Montana. Both the fibrous, semi-fibrous, and steatite varieties ar used by and. favored by paint, paper, plastics, rubber, roofing, insecticide, flooring, textile,composition flooring, and many other filler uses. Pharmaceuticals and cosmetics account for about 20,000 tons par year including soaps, creams, salves, rouges, and toilet powders, "Talcs for such use necessarily must be free of grit, of excellent color, and of small particle size,"- Attachments E .1.E CRMC-HT-.TALC-000I29 Vr" ^ y X- if\ , zj^f\ * / y y /fy^bFy , 7t /bfcUiT,' 'r/X'/ f '3 ^ J2J N < !/)<*?///aX/T'T.. $ ^ij-Z^Z^ '"' //r^V'K'- t f ; ^ / ^ -;; . ^ j , , S . . , y ., t i / V ~` _* /\X'f'Vv, if . F oA T F i/ VnXvT'lf Zh - jt\ ,, yyXy7Ao^.yHvC0^7 ^ i., *" < '*' `^ :> ^ V^ /to ~ Tl^yt^ J ZzjXffiZf^^?)Zi<r-7r>fiX..^rcX- z * ' f'Vf-XX\^i >. ^w -' X^vfFM 'pyZi M ? 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