REDETERMINATION and crystallographic analysis of the structure of Sb-containing Laffittite AgHg(As,Sb)S3 FROM CHAuvaI (Kyrgyzstan)
N. V. Pervukhina, S. V. Borisov, S. A. Magarill, V. I. Vasil'ev, N. V. Kuratieva
Keywords: Sb-laffittite, sulfosalt, PbS structural type, crystallography of cation and anion matrices
Pages: 712-716
Abstract
The crystal structure of laffittite mineral AgHg(As,Sb)S3 from the Chauvai deposit (Kyrgyzstan), containing about 10% of Sb atoms in the As3+ position, is re-determined (Aa space group, a = 7.7560(3) Å, b = 11.3340(4) Å, c = 6.6650(3) Å, β = 115.233(4)°, V =529.99(4) Å3, d = 6.078 g/cm3, Z = 4, R = 0.0229). Crystallographic analysis of the structure reveales the presence of quite regular face-centered cubic cation and anion sublattices, thus confirming the assignment of the structure to the structural type of PbS.
A deviation from the octahedral coordination of cations characteristic of this type is mainly related to a mutual asymmetric displacement of the cation and anion matrices.
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