Document Gm7MQKqeLrmZqZbLMLobmyQr7

FILE NAME: RT Vanderbilt (RTV) DATE: 1973 Aug 31 DOC#: RTV 180 DOCUMENT DESCRIPTION: J-M Memo Re Differences Among DESERTALC G-l, G-2, Vanderbilt & International NY State Talcs E fl Johns-Manviile Internal Corresponds To; F. J , Solon - .4 North Date: August 31, 1973 From: r . s. Lamar - R&D Center Copies; See below Sublet; DIFFERENCES AMONG DESERTALC G-l, G ~ 2 , VANDERBILT AND INTERNATIONAL JEW YORK STATE TALCS PER YOUR REQUEST O P A U G U S T '30, 1973 Desert Minerals mines two distinct grades of crude talc ore in Warn Spri: j s Canyon. These form the base for the bulk of our present talc business. G-l are contains 30 to 35 per cent tremolite and n o detectab: chrysotile by the usual petrographic and/or X~ray diffractio: methods. G-2 ore contains 5 to 10 per cent tremolite and again no detectable chrysotile by the usual methods of ana lysis. The New York State .talcs.produced by both R. T. Vanderbilt and International Talc Company are considerably higher in tremolite-- up to as much as 50 to 70 per cent and contain, in addition, significant amounts of chrysotile ^ .For' example differential thermal analyses (DTA) tests on some samples show nothing but serpentine {chrysotile is the fibrous varie; of serpentine). DTA does not distinguish between the fibrou; and non-fibrous varieties, but transmission electron micro graphs of these products confirm the presence of much chrysc tile. These are the major differences among these products. R. S', LAMAR rs cc ; W. L. V . A. J. M. H. R. R. p. G. E. VanDerbeek Martinson Sharratt Keefe Carter Parker -2 - 2 2 - 2 - 5 - 5 West West West West West West F. L. Pundsack - R&D Center S. speil - R&D Center W. c. S treib - R&D Center CRMC-HT-T ALC-000082