THE CRYSTAL STRUCTURE OF SKIPPENITE, BI2SE2TE, FROM THE KOCHKAR DEPOSIT, SOUTHERN URALS, RUSSIAN FEDERATION
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dc.contributor.author | Bindi L. | |
dc.contributor.author | Cipriani C. | |
dc.date.accessioned | 2022-11-11T08:24:04Z | |
dc.date.available | 2022-11-11T08:24:04Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14664034 | |
dc.identifier.citation | The Canadian Mineralogist, 2004, 42, 3, 835-840 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39629 | |
dc.description.abstract | Skippenite, Bi2Se2Te, was found in a sample from the Kochkar deposit, southern Urals, Russian Federation. The sample forms part of the mineralogical collection of the Natural History Museum of the University of Florence. Electron-microprobe analyses gave the chemical formula (Bi2.06Cu0.05Sb0.03)� 2.14Se2.00(Te0.89S0.11). The mineral occurs as anhedral grains up to 0.3 mm across. Skippenite is steel-grey in color, shows a black streak, and has a perfect basal cleavage. In reflected light, the mineral is greyish white, weakly bireflectant, nonpleochroic, moderately anisotropic in yellowish tints. Reflectivity values (Rmin and Rmax, in %) are 47.8, 48.1 (471.1 nm), 49.0, 50.2 (548.3 nm), 49.1, 50.3 (586.6 nm), and 49.3, 50.7 (652.3 nm), respectively. Skippenite is trigonal, space group R¯ 3m, with the following unit-cell parameters: a 4.183(1), c 29.137(3) Å, V 441.5(2) Å3 and Z = 3. The crystal structure has been refined to R = 2.93%. It consists of hexagonal close-packed sheets of Bi, Se and Te, respectively. The unit-cell of skippenite contains 15 layers, and the stacking sequence is: A'cBAc - B'aCBa - C'bACb, where A', B', C' = Te and S, A, B, C = Se, and a, b, c, = Bi. | |
dc.subject | skippenite | |
dc.subject | skippenite | |
dc.subject | chemical composition | |
dc.subject | physical properties | |
dc.subject | crystal-structure refinement | |
dc.subject | Kochkar | |
dc.subject | Russia | |
dc.title | THE CRYSTAL STRUCTURE OF SKIPPENITE, BI2SE2TE, FROM THE KOCHKAR DEPOSIT, SOUTHERN URALS, RUSSIAN FEDERATION | |
dc.type | Статья |
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