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Chinese Journal of Geology  1982, Vol. Issue (1): 111-116    DOI:
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TETRAAURICUPRIDE,CuAu DISCOVERED IN CHINA
Chen Keqiao1, Yu Tinggao2, Zhang Yongge3, Peng Zhizhong4
1. Institute Mineral Deposits, Chinese Academy of Geological Sciences, Beijing;
2. Xinjiang Geological Bureau;
3. Wuhan College of Geology
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Abstract Electron probe quantitative analysis of tetraauricupride with sterling elements Cu,Au as standards (wt%),gives Cu 23.74 (%).Au 75.81 (%).The empirical formula is (Cuo.3736 Auo.3817).The ideal formu’a is CuAu.The mineral belongs to tetragonal system with a0=3.89 (Å),c0=3.72 (Å),z=2.Space group is D4h1=C4/mmm.There are two molecules in a unit cell,with its theoretical specific gravity (by Cu:Au=1:1) Dx=14.67.The strongest lines of X-ray powder diffraction pattern are (in Å) : 2.24 (10) (111),1.99 (5) (020),1.55 (4) (112),1.36 (4) (202),1.195 (10) (131),1.25 (doublets (6) (113,222),1.040 (doublets) (5) (207,312).The mineral grain is irregular,600×350×50μm.Its hardness is VHN20=294,equivalent to the Moh’s hardness 1.6.The new mineral is weak anisotropic,with spectral reflectivities,as follows (σ,R%) : 405 nm 44.6,436 nm 46.8,480 nm 50.3,526 nm 55.8,546 nm 61.2,578 nm 74.4,589 nm 76.6,622 nm 83.6,644 nm 84.9,656 nm 85.4,664 nm 86.6,and 700 nm 97.3.Color copped red,with a yellow tint.Strong metallic luster.The mineral doesn’t dissolve in hydrochloric-,sulphuric-and nitric acid.Tetraauicupride was found in a platinum-bearing basic-ultrabasic stock at Sardala,Manas County,Xinjiang Autonomous region.Associated minerals are diopside,tremolite,apatite,zircon,mangetite,chromite,pyrrhotite,pyrite,chalcopyrite,gold,silver and platinum group minerals.The mineral is named after its symmetry and chemical composition.The type specimens are kept in the Geological Museum of the Ministry of Geology in Beijing.Discussion (by the authors):1.The tetragonal C-face-centred lattice is taken for comparing with the structures of gold,copper.The space group and cell parameters of the new mineral can be converted into tetragonal system,space group D4h1=P4/mmm,with a0=2.815 (Å),C0=3.720 (Å),z=1.2.Auricuperide,CuAu,tetragonal,a,c=2.81,3.72 (Å),z=1.It was known only in Klockmann’s Lehrbuch der Mineralogie (1978,p 395).The unnamed mineraloccurred in Hortonolithdunit,Sud-Afrika.
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Chen Keqiao
Yu Tinggao
Zhang Yongge
Peng Zhizhong
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Received: 1981-04-11;
Cite this article:   
Chen Keqiao,Yu Tinggao,Zhang Yongge et al. TETRAAURICUPRIDE,CuAu DISCOVERED IN CHINA[J]. Chinese Journal of Geology, 1982, (1): 111-116.
 
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