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FILE NAME: Talc (TALC) DATE: 1971 Sept 9 DOC#: TALC421 DOCUMENT DESCRIPTION: Desert Minerals, Inc. - Definitions Asbestos & Talc Minerals . d e s e r t MINERALS, INC. . DEFINITIONS ASBESTOS & TALC MINERALS Segregated September 9 1971 Definitions from ''Industrial Minerals and Rocks'5 - 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 dlf- fcrlng in chemical and other properties. Six varieties: !.. ,CURTSOTILE - finely fibrous form of serpentine. __ and five minerals of the AMPHIBOLE group: 2. AMGSITE - not fully recognized as a mineral but accepted in asbestos ' . terminology. ' 3. ANTH0PHYLL1TE ' ' ., ' L,, CROCIDOLXTE ' . 5- TREMOLITE ' 6. ACT1N0LITE , -.. . : . . ' CHRYS0T11E . , ; ; rhrvsotile Is the result of hydrothermal reactions within the serpentine rock ft be per'doSti: tol, P u n i t e of perpenflni.ed do:Loaltlo 11 l8 tM t * * * * ; * asbestos i".;:rir.pSS" ^ 1 .. * separated and can be spun or woven. __ CRDCIDOLITE and AMOSITE : : ; Crocidol!te and Amosite occur in metamorphosed siliceous-ferruginous, sediments, again not common with talc. . ANTHOPEYLLITE and TREMOLITE Both ha - a low ignition loss. Anthophylllte is similar to tremoiite except iris S ^ i b e T b e ' e p i TM b 1 S " r . t " q J r K ' L k . th j M ? 1 beeto. chmenta. Both are known to be present in some talcs or associated with them. CRMC-HT-TALC-000127 oS&r MINERALS, TMfi.. DEFINITIONS ASBESTOS &TALC MINERALS, Page 2 , September 9, 1971 CURVSOTILE ' 1 ' Chryjotile c o n a t it u t e s about 93% o f th e current world production of aabestoe, almost all of which la derived from lost rocks which are ultrabasic In composition, the balance being derived from aerpentlzed dolomltic limes tone. Approximately 5 M ot the world production is from amosite and crocodolite. TremoUte and anthophyllite account for only 1.6% of the world production, mostly for filler Use. . . . Production of the Amphibole varieties of asbestos, other than amosite apd , crocidolite is comparatively limited. In the United States the Production of sntophyllite has been 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. TremoUte is an almost negligible type industrially. TALC and SOAPSTONE (Pages 835 to 850) Talc, the mineral, Is a hydrous magnesium silicate,with a suggesfed_theoretlcal formula H2Mg3(8 1 0 3 ) 4 or H20.3Mg6.4Si02, which postulates 63.5% S102, 31.7% MgO, and 4.8% H2 O. Industrial talcs do not approach above composition but are "mixtures of silicates that contain appreciable proportions of magnesia." Other minerals common in- in. talc are serpentine, chlorites. TREMOLITE, ANTHOPHYLLITE, diopslde, and quartz. The carbonates are also present -- calcite, dolomite, and magnesite, . Some of these minerals have a pronounced effect on the properties of the laic. Some are highly desirable for. a specific use. "An example of this type Is desirable tremolitic 'talc' mined in New York state,,and California and ideally suited for use in' some painTs"nd ceramics." Much of this type of talc contains 50% or more of TREMOLITE. " v.. ...... ....^ ... . : ... STEATITE TALC V . ' Massive talc-rich material and refers to an especially pure talc that contains no more than 1,5% CaO, 1.5% combined.Fp.O and F e ^ O y or 4% Al20l. Pure f .as a hardness of 1.0 to 1.5, la relatively inert and remains undecom posed in convict with acids. '* , : . ' Most talc and soapstone deposits occur in altered ultrabasic igneous rocks and In metamorphosed dolomltic limestones. (Page 837 - Occurrence and Distribution). .. Most deposits are localized along shear and shatter zones_ln a nearby static environment. On the other:hand, in the SILVER COUVERHEUR-. New York zones of talc schist, intimately associated ^ v i t ^ M M i v e ,bodia 0 tremolitic rock appear to have been formed during strong sock deformation* CRMC-HT-TALC-000128 DS3EET MN8PALS, INC., MUNITIONS ASBESTOS & TALC MINEMM, Paga 3 September 9, J971 TALC and dOAPatOMS (continued) - . glacially productive and high grad talc deposits ioraed by the alteration of magnesium carbonate sedimentary rocks, occur in Northern New York, Eastern California, and Montana. . *. , . . ' The New York deposits near Gouverneur, New York, consists of ''fibrous talc" composed largely of tremolita, anthopfrylllte,' serpentine, and tale. In the rgion of Southern Death Valley and the Kingston Mountains tal^deposita ara composed of fipe-grainad tremollte and the mineral talc in both foliated and massive varieties, Talc deposits in the Myo Mountains of California and the Palmetto-Oasis 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 are 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-pf small particle size."' 7 ' ' . 777- ' . - Attachments E.J.E. CRMC-HT-TALC-000129 Vr" ^ y X- if\ , z j^f\ * / y y /fy^bFy , 7t /bfcU iT,' 'r/X '/ f '3 ^ J2 J N < !/)<*?/// a X / T ' T .. $ ^ij-Z^Z^ '"' t f ; ^ / ^ -;; . ^ j , , S . . , y ., t i / V ~` _* /\X'f'Vv, if . //r^V'K'- F oA T F i/ VnXvT'lf Z h - 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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