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eae e TS Colorad of Mines Research -- TST ee oe titute February 25 1977 ' CSMAICSMAI CSMACISMAI PO BOX 112 GOLDEN COLORADO 80401 PHONE 303 279-2581 CSMAI CSMAI CSMRI Project C10704 Mr. William H. Ashton Johnson & Johnson Baby Products Company U.S. Route No. 202 Research 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 head and tail samples were examined for the purpose of guiding the 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 tale no additional minerals were identified in the untreated bulk product Heavy liquid separations at 2.8 2.8 specific gravity plus specific gravities of 3.3 for the tail and 2.68 for the product followed by XRD of all fractions identified numerous additional minerals as tabulated in Table . 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 ate Mineral kartustry kartustry Research Research COLORADO SCHOOL OF MINES RESEARCH TITUTE 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 This was achieved by the sample raying in the product at a performing a 2.68 the light fraction , level estimatetdo be 6-9 ppm specific gravity separation on 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 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 nee te pen yw pues Onan ts qcemtenh we Awe TR Ot bute a eas whmeremecan JNJ 000253066 = COLOR SCHOOL OF MINES RESEARCH STITUTE Mr. William H. Ashton Johnson & Johnson February 25 1977 Page 3 This completeousr work on the 3-16-76 experimental series product head and tail Very truly yours Teny Teny : Teny Teny Teny Krause Jerry Krause Projects Manager Mining Division cjm Enc JNJ 000253067