Jichengite 3CuIr(2)S(4)center dot(Ni, Fe)(9)S-8, a New Mineral, and Its Crystal Structure

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	Jichengite 3CuIr(2)S(4)center dot(Ni, Fe)(9)S-8, a New Mineral, and Its Crystal Structure
	Yu, ZX (Yu Zuxiang); Hao, ZG (Hao Ziguo); Wang, HG (Wang Hanggen); Yin, SP (Yin Shuping); Cai, JH (Cai Jianhui)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2011
卷号	85 期号:5 页码:1022-1027
关键词	jichengite crystal structure mineral
ISSN号	1000-9515
英文摘要	A new mineral, jichengite ideally 3CuIr(2)S(4)center dot(Ni,Fe)(9)S-8, was found as a constituent of placer concentrates at a branch of the Luanhe River, about 220 km NNE of Beijing. Its associated minerals are chromite, magnetite, ilmenite, zircon, native gold, iridium, ferrian platinum and osmium. The placer is distributed at places around ultrabasic rock, which hosts chromite orebodies, from which PGM originated. Jichengite occurs commonly as massive or granular aggregates. No perfect morphology of jichengite was observed. It is steel gray and opaque with metallic luster and black streak. It has a Mohs hardness of 5, VHN (d) mu m 21.65, H-m 4.465, H-v = 268.1 N/um(2). It is brittle and weakly magnetic. Cleavage {010} is rarely observed. No fracture was observed. Density could not be measured because of its too small grain size. Density (calc.) is 7.003 g/cm(3). Reflect light is reddish-brown, without internal reflections. Anisotropism is distinct with grayish or yellowish white in crossed nicols and bluish violet-copper red in uncrossed nicols. Jichengite shows weak pleochroism and strong bireflectance. The reflectance values in air at the Standard Commission on Ore Mineralogy wavelengths are 38.9, 34.3 at 470 nm, 38.9, 34.5 at 546 nm, 39.1, 35.3 at 590 nm, 39.2, 36.8 at 650 nm, parallel-axial extinction. The six strongest lines in the X-ray powder-diffraction pattern [d in angstrom, (I), (hkl)] are 3.00 (100) (116), 2.80 (50) (205), 2.48. (50) (208), 1.916 (40) (2, 1, 10), 1.765 (60) (220), 1.753 (50) (2, 0, 16). Five chemical analyses carried out, yielding the following results S 25.76 (25.49-5.97), Fe 10.03 (9.78-10.31), Co 0.78 (0.75-0.81), Ni 12.48 (12.32-12.85), Cu 4.77 (4.69-4.83), Ir 46.98(46.14-47.89), sum 100.80wt%, which produced a formula (Cu1.556Fe0.976)(2.532)(Ir5.063S10.126)center dot(Fe2.7451Ni4.404Co0.273)(7.422)S-6.517. The ideal formula is X10Ir5S17.5, which was calculated by single crystal structure analyses, where X = Cu(H) + Fe(II) + Ni(H) + Co(II). The single crystal data were collected using a diffractometer with Mo K alpha radiation and a graphite monochromate. The crystal system is trigonal with space group R3m and unit cell parameters a=7.0745(14) angstrom, c=34.267(10) angstrom (The superstructure not found), and the final R Indices [with 564 observed reflections, I>2sigma (I)] are R-1=0.0495, wR(2)=0.1349. The specimens are deposited in the Geological Museum of China.
学科主题	结晶学与矿物学
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000295513600008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39419]
专题	中国地质调查局
作者单位	Nankai Univ, Chem Acad, Tianjin 300071, Peoples R China
推荐引用方式 GB/T 7714	Yu, ZX ,Hao, ZG ,Wang, HG ,et al. Jichengite 3CuIr(2)S(4)center dot(Ni, Fe)(9)S-8, a New Mineral, and Its Crystal Structure[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2011,85(5):1022-1027.
APA	Yu, ZX ,Hao, ZG ,Wang, HG ,Yin, SP ,&Cai, JH .(2011).Jichengite 3CuIr(2)S(4)center dot(Ni, Fe)(9)S-8, a New Mineral, and Its Crystal Structure.ACTA GEOLOGICA SINICA-ENGLISH EDITION,85(5),1022-1027.
MLA	Yu, ZX ,et al."Jichengite 3CuIr(2)S(4)center dot(Ni, Fe)(9)S-8, a New Mineral, and Its Crystal Structure".ACTA GEOLOGICA SINICA-ENGLISH EDITION 85.5(2011):1022-1027.