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FILE NAME Talc TALC DATE 1956 July 17 DOC TALC407 DOCUMENT DESCRIPTION Confidential Memo from M Research Center - Micro Examination of Talc CONFIDENTIAL Memorandum MA12-38 : MANVILLE RESEARCH CENTER Pied Date Btalsae July 17 1956 rome ie slinaae seen MOTTO RTI MICROSCOPIC EXAMINATION OF TALC FROM FASTERN MAGNESIA TALC CO BURLINGTON VERMONT An examination was made of powdered talc supplied by Eastern Magnesia Tais Company and used by Manville Corporation This material was compared with the three following commercial talcum powders Johnson and Johnson Cashmere Bouquet Mennen o Baby Powder The results of the examination are as follows | A. Eastern Magnesia Tale Company W Over 95 of the sample was tule Mg3S14010 Of this amount less than 10 could be considered elongated or fibrous appearing the balance consisting essentially of platey talc particles that ranged in particle size from 125 54. Total impurities were estimated microscopically to be less than % of the sample as follows Chlorite Mg Fe Fe Dolomite Ca Mg 003 Pyrrhotite ? FelixS Tremolite , CaCa2M2 g5 MCa2Mgg5 5 19129222 OH2 S13010 OH Major Impurity Minor Impurity ~ Trate Impurity Minor Trace ImIpmpuriuty rity Impurity 12 Johnson and Johnson Baby Powder - The sample consisted essentially of tale over 90 of which was platey particles 125M to 5...and less than 10 of which were elongated particles The principal impurity was dolomite present in trace amounte C, Cashmere Bouquet -The sample was essentially platey particles of tels ranging in size.from 100/44 less than 5.4 Less than 10 of the tale was elongated particles The sample also contained traces of dolomite and magnesite MgCO3 D, Mennen Talc -- The sample consisted essentially of tale over 90 of which were platey particles ranginign size from 1754down to Less than 10 particles of the talc of magnesite had a fibrous or elongated appearance were present Trace amounts In my opinion with the exception of the slightly higher impurity content the talcum powder used by Manville is similar in min^'ralogical composition particle size distribution and shape to that of the three representative and commonlycomonly used talcum powders that were submitted for comparison Iz CO C. L. Sheckler virt Manville Plant 3 G. R. Williams A. B. Cummina H. L. King Jr. . Kad Kad 2. Kad F. L. Kadey Research Mineralogist 000045