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Yixunite and Damiaoite—A Twin of New Native Alloys of Indium and Platinum from the Yanshan Mountains

Acta Geologica Sinica(English Edition) 1997年第4期71卷 480-485,512-513页

作者： yu zuxianginstitute of geology, Chinese Academy of Geological Sciences, 2. baiwanzhuan,{2. Institute of geology Chinese Academy of Geological Sciences 26 Baiwanzhuan Beijing 100037 [?]yu Zuxiang Born in 1930 graduated from the Specialty of Mineralogy and Petrology Beijing College of Geology in 1953 now Research Professor of the Institute of geology Chinese Academy of Geological Sciences having long engaged in the study of mineralogy.

Yixunite and damiaoite Were found in a cobalt- and copper-bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoite occur as immiscible globules, 1.0 to 2.0 mm in diameter. Yixunite is always in the central part of a globule. It is opaque with metallic lustre, bright white colour and black streak. HM = 5.8; VHN50 = 634 kg/mm2.(573-681 kg/ mm2.; insoluble in HCl, HNO3, HF or H3PO4; no cleavage; no magnetism. Density is hard to measure because of small grain size. Calculated density = 18.2. g/cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are: Pt 82.8 (81.8-83.6), In 16.4(15.6-17.1) and total 99.2. The empirical formula (based on 4 atoms) is Pt2.993 In1.007 . The five strongest lines of X-ray diffraction (hkl, d,I) are 111, 2.30 (100); 2.0, 1.99 (60); 2.2. 1.411 (40);311, 1.2.3 (80); 2.2. 1.151(40). Space group: Pm3m with a =0.3988(3) nm and Z= 1. Damiaoite occurs as single globules or was exsolved from yixunite. Opaque with metallic lustre; bright white colour with black streak; HM = 5.3; VHN50 = 485 kg/mm2.(434-52. kg/mm2.; insoluble in HC1, HNO3, HF or H3PO4; cleavage: no; magnetism: no. Density: hard to measure because of small grain size. Calculated density = 10.95 g/ cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are Pt 45.6 (45.4-46.0), In 53.5 (52.4-53.9), total 99.1. The empirical formula (based on 3 atoms) is Pt0.002.In1.998. The six strongest lines of X-ray diffraction (hkl.d,I) are 2.0,2.2. (100); 311,1.92.(60); 400,1.59 (60); 42.,1.2.9 (80); 440,1.12. (60); 62.,1.006 (70). Space group: Fm3m with a = 0.6364 (3) nm and Z = 4.

关键词： yixunite damiaoite new native alloys cobalt- and copper-bearing platinum ore vein contact metasomatic deposit

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Changchengite—A New Iridium Bismuthide-Sulphide from the Yanshan Mountains

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Acta Geologica Sinica(English Edition) 1997年第4期71卷 486-490,514页

作者： yu zuxianginstitute of geology, Chinese Academy of Geological Sciences, 2. baiwanzhuang,{2. Institute of geology Chinese Academy of Geological Sciences 26 Baiwanzhuang Beijing 100037 [?]yu Zuxiang Born in 1930 graduated from the Specialty of Mineralogy and Petrology Department of Geology Beijing College of Geology in 1953 now research professor at the Institute of geology Chinese Academy of Geological Sciences. He has long engaged in the study of mineralogy geochemistry and mineral deposits related to ultrabasic rocks. He is a member of the Committee on New Minerals and Minerals Names of GSC.

Changchengite occurs in chromite orebodies in dunite and in platinum placer deposits in chromite orebodies nearby. The mineral occurs as massive aggregates or veinlets on margins of iridisite (IrS2. and replaces it. Opaque. Lustre metallic. Colour steel-black. Streak black. Hm = 3.7. VHN2.= 165 kg/ mm2. Isotropic. Cleavage none. Density 11.96 g/ cm3. Seven electron microprobe analyses give the following mean chemical results (wt. %): S 7.2. Cu 0.3, Te 0.4, Ir 41.2. Pt 2.8 and Bi 47.3 with total 99.1. The simplified formula is IrBiS. The strongest X-ray powder diffraction lines (hkl, d, I) are 2.0, 2.75 (70); 2.1, 2.51 (60); 311, 1.860 (100); 440. 1.090 (50) and 600, 1.02. (50). The X-ray powder diffraction pattern is similar to that of mayingite. After the diffraction data are indexed the mineral is determined to be cubic. The space group is P2.3 with a = 0.6164(4) nm, V = 0.2.42.nm3 and Z = 4.

关键词： changchengite new mineral new iridium bismuthide-sulphide Yanshan Mountains chromite ore body platinum placer deposit

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