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FILE NAME: Johnson & Johnson (JAJ) DATE: 1973 Feb 26 DOC#: JAJ065 DOCUMENT DESCRIPTION: Report - Mineralogical Examination of Five Talc Samples by Colorado School of Mines Research Institute MEMORANDUM Colorado School of M ines R esearch I nstitute P.O. Box 112 i Golden, Colorado 80401 to W, H. Ashton oate February 26, 1973 pr o m W .p. Reid and W. T. Caneer ^ . , . . .010704 OBJECT Mineralogical Examination of Five Talc Samples ri ) ! (. In compliance with your request, mineralogical studies were made on the following talc samples: 30-71-S 30-B-7I-S 30-C-71-S 32-71-S 34-71-S i The purpose of these studies was to determine the mineralogy of these samples with an emphasis on the occurrence of any asbestos type i m inerals. X -ray Diffraction and microscopic studies were made on as- s received samples, heavy liquid separates, and on acid leached residues, ^ f 5 ' SUMMARY The following table shows the nature and relative abundance of minerals in each sample. r Saask 30-71-S Mineralogy Major >40%) talc [Mg^4010(OH)2] Moderate (20-40%) magnesite (MgCOs) ] Trace (<1%) chlorite / Trace calcite (CaCOs) and dolomite [CaMg(CO)3)2] T race opaques (Fe oxides, etc.) Slight trace (<0.1%) trem olite-actinolite (Ga-Mg-Si-O-OH) i 30-B-71-S Major .talc Moderate magnesite T race dolomite and calcite T race opaques i Slight trace chlorite Slight trace tremolite -actinolite I . 1 Protected Document-Subject to Protective Order JNJNL61 000008084 I ilBMORANDUM C olorado School of Mines R esearch P.O. Box 112 G o l d e n , C o l o r a d o 80401 I nstitute I J,T. FROM. SUQJKOT ! W.H. Ashton W. P. Reid and W, T. Caneer Mineralogical Examination of Five Talc Samples Page 2 February 26, 1973 Cl 0704 Sample , ,__________ ________ Mineralogy 30 -C - 71-S Major talc Minor (5-20% magnesite Very minor (1-5% chlorite) fl Trace calcite and dolomite A Slight trace opaques 1 32-71-S Major talc Moderate magnesite Very minor chlorite and possible serpentine [Mg3Si2C>5{OH)4] Trace calcite and dolomite Very minor opaques Slight trace anthophyllite (?) [(MgiFe)7(Si80 22(OH)3] 34-71-S Major talc Minor magnesite Very minor chlorite Very minor dolomite Trace mica DK-Al-Si-O-OHJ Trace opaques ] Relative to possible asbestos type m inerals the above table shows that Samples 30-71-S and 30-B-71-S contain slight'traces of trem olite- j actinolite m inerals. Sample 32-?l *S is .suspecfed to contain a very minor A amount of serpentine which may be chrysotiie. In addition a slight trace 3 of possible anthophyllite was observed in this sample. It is recommended that more studies be made on greater quantities of Sample 32-71 -S to con firm the presence of these minerals. 1 1 Protected D ocum ent-Subject to Protective Ortjer' JNJNLB1_00000808B mcmorandum C olorado School of M ines R esearch I nstitute P.O. Box 112 Goldin, Colorado 80401 r. TO P!l *' FROM *i . * . subject f) >i W.H. Ashton W. P. Reid and W. T. Caneer OAT F R O JK O T MO. M ineralogical Examination of Five Talc Sampl.es Page 3 February 26, 1973 C 10704 1 RESULTS AND DISCUSSION Each sample of ground talc ore was separated into the following fractions by centrifuging in heavy liquids: specific gravity less than 2.90; specific gravity greater than 2.90. After m akinganX-ray diffractgram of ft*. the greater than 2.90 specific gravity fractions, toe sample was leached a With 1:1 HC1 to remove magnesite. The insoluble residue was then examined for amphiboles under toe petrographic microscope. The weightpercent in toe various fractions as well as toe mineralogy of each fraction is shown in toe following table. JiBBPk- Weight. % 30-^1-S < 'Specific gravity#* 2.90 100.0 74.5 Major -40%) talc Very minor (1-5%) dolomite T race (<1%) chlorite T race calette and magnesite r Specific gravity Sz.90 25.5 Major magnesite Very minor talc Trace dolomite and calcite HC1 leach residue 0.4 Major opaques (magnetite; e tc .) Major talc Slight trace (<0.1%) trem oliteactinolite 30-B-71-S Specific gravity < 2.90 100.0 76.4 Major talc. Minor (5-20%) magnesite Trace dolomite Slight trace chlorite Protected D ocum ent-Subject to Protective o rd e r JNJNL61_0000080*6 memorandum I I C olorado School of Mines R esearch I nstitute P.O. Box 112 G o l d e n , C o l o r a d o 80401 1 SU E J E C T r W. H. Ashton DATE February 26, 1973 W. P . Reid and W. T. Caneer PROJECTNO. -C 10704 Mineralegical Examination of Five Talc Samples Page 4 i Sample 3 0 -B -7 I-S (cont'd) i- Specific, gravity >2, 90 f i -. HC1 leach residue 30-C-71-S . Specific gravity <2.90 1 1 Specific gravity >2.90 1 HC1 leach residue 1 32-71.-S 1 Specific gravity <2.90 1 Specific gravity >2. 90 3 4l y 1Protected D ocum ent-Subject to Protective O rder Weight. % ________ Mineralogy 23.6 Major magnesite Very minor talc Trace calcite 0.4 Major talc . Major opaques (magnetite, sulfide, etc. ) Slight trace tremolite-actinolite 100.0 90. 5 Major talc Minor magnesite Very minor chlorite Trace dolomite 9. 5 Major magnesite Minor talc and dolomite Trace calcite <0.1 Major opaque Minor talc 100.0 58. 4 Major talc Very minor magnesite Very minor chlorite and serpentine (?) Trace calcite 41. 6 Major magnesite Very minor talc Trace dolomite Slight trace calcite JNJNL61 000008087 MEMORANDUM C olorado School of M ines R esearch P.O. Box 112 G o l d e n , C o lo r a d o 80401 I nstitute W. H. shton DATE from SUBJECT W.P. Reid and W.T. Caneer Mineralogical Examination of Five Talc Samples . ................... ........... i Page 5 February 26, 1973 C10704 ] Sample________ Weight. % Mineralogy 32-71-S (cont'd) HC1 leach, residue 2.5 Major talc Minor opaques Slight trace anthophyllite (? ) 34-71-S 100.0 1 Specific gravity <2. 90 80, 9 Major talc Very minor magnesite Very minor chlorite II . Specific gravity >2. 90 19.1 Major magnesite Minor dolomite 1 HC1 leach residue Trace mica 0.4 Major opaques 1 Minor talc 1 In an attempt to verify the presence of serpentine in Sample 32-yi-S X-ray diffraction step scans were made over the critical diffraction peaks of serpentine. Figure 1 shows the results of the step scanning. Since , both chlorite and serpentine have diffraction peaks in the 7 region, it is I possible to confuse these minerals based only on a..71 peak. However, a i corresponding peak in the 14i region verifies the presence of chlorite. Curve 1 (Figure 1) represents a step scan across the 7 l region for the as-received Sample 32-71-S. As may be seen two peaks occur at 7. 11 i and 7. 3A. In order to determine if these peaks represent chlorite or possibly serpentine, step scans were made across the 14A region. If this 7. l l and 7. 3l peaks represent chlorite, then there should be corresponding 1 peaks* at 14. 2 l and 14. 6l. Curve 1A is a step scan across the 14l region. At 14.2 l peak occurs which corresponds to the 7. ll peak. These 2 peaks represent chlorite. However, no .14. 1 peak is present which suggests that tile 7. 3i represents serpentine-not .chlorite. * I Protected D ocum ent-Subject to Protective Order JNJNL61_OOO0OSO88 memorandum ft C olorado School of M ines R esearch I nstitute P.O. Box 112 G o l d e n C o l o r a d o .80401 TO W. H. Ashton ______ oATB W. P. Reid and W. T. Caneer EROM -- PROJECT NO. WWMT MineralogiCal Examination of Five Talc Samples ""PageTT"^"'^""- February 26, 1973 C10704 1 a Since colorite has a specific gravity greater than 2. 65 and serpentine has a specific gravity less than 2. 65, step scans were made on the fraction of Sample 32-71-S which has a specific gravity less than 2; 65. The less J than 2.65 specific gravity fraction was 0.4 weight percent of the total sample. If serpentine is present the 7. 3A.peak should be enhanced and the 7. U chlorite n peak should be diminished. Curve 2 represents a step scan across the J - 7-Aregion of the fraction with a specific gravity less than 2.65. As may ^ be seen the 7. 3peak is enhanced and the 7. U peak is diminished relative d. to the as-received sample. Curve 2A (step scan across the 14l region) J shows no 14.61 peak. a Based on the above step scanning data there is good reason to suspect that' serpentine is present in Sample 32-71-S. It is possible that other T m inerals such as kaolinite or a very iron rich chlorite could give sim ilar 3 data. However, based cm the geological and chemical factors associated with this sample, it is more probable that chlorite present will be mag nesium -rich rather than iron rich and that serpentine is a more likely 3 occurrence than kaolinite. J Microscopic examination of the fraction with a specific gravity \3: lfeibsesrtsh. anId2e.6n5tifriceavteioalnedofvtehreysmeripneonrti(n1%e )waams ofuancitslitoaftepdosbsyibslteaisneirnpgenwtiitnhe 1% iodine in glycerine. It is recommended that further work be done on this sample. t . rb . PretMtWl Qtfw JN J N L 6 1 J J 0 00080*9