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- Title
Crystal structure of natural Ag-Cu-Pb-Bi sulfide.
- Authors
Borisov, S.; Pervukhina, N.; Kurat'eva, N.; Magarill, S.; Kuchumov, B.
- Abstract
The crystal structure of a natural sulfide CuAgPbBiS ( Сmcm, Z = 4, a = 3.973(1) Å, b = 13.370(2) Å, c = 42.182(7) Å, R = 0.059) is determined. The structure has seven cation positions: two of them (Cu and Ag) are in a tetrahedral environment of sulfur atoms; one (Pb), in a special position ( mm2), has a coordination polyhedron in the form of a bicapped trigonal prism; and the other cation positions are surrounded by sulfur atoms forming distorted octahedra. The mirror symmetry plane perpendicular to the c translation causes microtwinning by cutting a layer of trigonal prisms framed by tetrahedron ribbons. These layers are divided by those composed by edge-linked octahedra with a diagonal ribbon of five octahedra ( N = 5). The cation and anion positions are ordered by individual sublattices with pseudohexagonal subcells on the m planes perpendicular to the a translation, which concentrate the positions of all the atoms. Supposedly, this natural sulfide is the previously described (1885) yet unconfirmed alaskaite mineral from the lillianite-heyrovskyite homological series and may be isostructural to the ourayite mineral.
- Subjects
CRYSTAL structure; SULFIDE crystals; TETRAHEDRA; OCTAHEDRA; CRYSTALLOGRAPHY
- Publication
Journal of Structural Chemistry, 2017, Vol 58, Issue 1, p78
- ISSN
0022-4766
- Publication type
Article
- DOI
10.1134/S0022476617010115