Document B53aOqxBvDbg0V64GVbEBokYk

FILE NAME Johnson & Johnson JAJ DATE 1977 Feb 25 DOC JAJ220 DOCUMENT DESCRIPTION Letter from CSMA to Mr. Ashton & with talc sample analysis Colorado School of Mines Research Institute February 25 1977 CSMRI Project C10704 CSMR P.O. BOX 112 GOLDEN COLORADO 80401 PHONE 303 279-2581 Mr. William H. Ashton Johnson & Johnson Baby Products Company Research U.S. Route No. 202 Raritan NJ 08869 Dear Bill This letter is a report of the results of our examination of talc samples designated as Experimental Talc Series 3-16-76 Product Head and Tail These samples were examined with the purpose of identifying all minerals present even those at a level of a few parts per million The head and tail samples were examined for the purpose of guiding the identification of minerals which might be present in the product at very low levels The methods of examination and identification were ray diffraction XRD before and after concentration by heavy liquid separation handpicking for ray diffraction and electron microprobe analysis SUMMARY ray diffraction of the bulk product identified approximately % each of magnesite and chlorite and approximately % dolomite Other than talc no additional minerals were identified in the untreated bulk product Heavy liquid separations at 2.8 specific gravity plus specific gravities of 3.3 for the tail and 2.68 for the product followed by XRD of all frac- tions identified numerous additional minerals as tabulated in Table 1 Electron microprobe analysis identified minerals additional to those listed in Table 1. The total suite of minerals identified in the product are talc magnesite dolomite chlorite quartz pyrite pyrrhotite pentlandite chromite magnetite ilmenite rutile apatite and muscovite ' Protected Document to Protective Order Mineral Industry Research JNJNL61_000017288 JNJNL61_000017288 COLORADO SCHOOL OF MINES RESEARCH INSTITUTE Mr. William H. Ashton Johnson & Johnson February 25 1977 Page 2 DETAILS Heavy liquid separations were run on all samples in order to concentrate those phases present at low levels so that their detection and identification could be readily achieved Quartz was identified in the product at a level estimated to be 6-9 ppm This was achieved by performing a 2.68 specific gravity separation on the sample raying the light fraction and estimating the amount of quartz present as follows Wt g Wt % Qtz in XRD Estimated Original Wt % x Wt % Qtz = Sample 2.68 sp gr 0.009 0.028 2-3 6-9 ppm As shown in Table 1 2.8 specific gravity separations and ray diffraction identified large amounts % of talc magnesite dolomite and chlorite Small amounts 0.1 % of pyrite pyrrhotite pentlandite and rutile were also identified by this technique Electron microprobe examination of a polished grain mount of the 2.8 specific gravity fraction of the product allowed identification of several additional minerals as follows chromite ilmenite nickeliferous pyrrhotite apatite muscovite and a phase consistent with the composition of anthophyllite Also identified by microprobe were quartz pyrite pyrrhotite pentlandite bearing pentlandite and rutile Several accicular grains were handpicked from the 2.8 specific gravity fraction of the product and rayed in a Gandolfi camera in an attempt to confirm the presence of anthophyllite The XRD pattern of these grains showed only talc Photographs of the five grains rayed are attached and it appears as though they are talc pseudomorphous after amphibole Amphibole was not conclusively identified in the sample Protected Document to Protective Order JNJNL61_000017289 JNJNL61_000017289 COLORADO SCHOOL OF MINES RESEARCH INSTITUTE Mr. William H. Ashton Johnson & Johnson February 25 1977 Page 3 This completes our work on the 3-16-76 experimental series product head and tail J Very truly yours Teny Krause Jerry Krause Projects Manager Mining Division cjm Enc Protected Document to Protective Order JNJNL61_000017290 JNJNL61_000017290