Document zdZYGEKY2BMjogYQkKvkKdwV7

FILE NAME Talc TALC DATE 1971 Sept 29 DOC TALC430 DOCUMENT DESCRIPTION Letter to Desert Minerals Inc. From American Conference of Govt Industrial Hygienists oer oe ard suit . . Ot 203 ce Rg Hae es V ~ haceman cokhn. 400 400 th eae . ral at cebee 0 Jim the gene as Steali 4 svaku Spani Chaminen alact veransjustere 49 4929T 7 5.3 4175 4175 AMERICAN CONFERENCE GOVERNMEGNTAL OVERNMENTAL INDUSTRIALHYGIENISTS September 29 1971 Mr. E. J. Ellsworth Desert Minerals Inc. . 1891 South Coast Highway- Laguna Beach California Dear Mr.Ellsworth = 1 In answer . to your letter ofSeptember 22 22 regarding a mineralogic definition differentiating betweenfibrous andashestiform TALC I am pleased t 19o 71q.u.oa te from a veryrecentarticle that appearedin Science September17 There isnofirm mineralogie definition ofcommercial tale - and in mostareas. the mineral talc forms much less than half of commercial talc Thecomposition of commercial tale varies | with Vermont granular _ the deposit relatively produce platy or asbestos ong 3 f minerals New 7 including and California talcs containmorefibroussilicates - Boehner . Reference 1referstoWeissand Arch EnvironHealth Health14304 1967 Reference 2refers to Wright Talc and Soapstone Calif Divn of Mines ' Mineral _ Pub Bull 176 San Francisco Reference 3 refers to Wells Mines of ~p Facts aand ProblemsU.S.Bu Washington Sincerely yours Stokinger Herbert E. Threshold LimitsCommittee 000105