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

Changchengite—A New Iridium Bismuthide–Sulphide from the Yanshan Mountains 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. VHN20= 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, f) are 210, 2.75 (70); 211, 2.51 (60); 311, 1.860 (100); 440, 1.090 (50) and 600, 1.027 (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 P 213 with a = 0.6164(4) nm, V = 0.2342 nm3 and Z = 4. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

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

Acta Geologica Sinica (English Edition) , Volume 71 (4) – Dec 1, 1997

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References (11)

Publisher
Wiley
Copyright
1997 Geological Society of China
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/j.1755-6724.1997.tb00387.x
Publisher site
See Article on Publisher Site

Abstract

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. VHN20= 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, f) are 210, 2.75 (70); 211, 2.51 (60); 311, 1.860 (100); 440, 1.090 (50) and 600, 1.027 (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 P 213 with a = 0.6164(4) nm, V = 0.2342 nm3 and Z = 4.

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Dec 1, 1997

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