Study on the Crystal Structure of the Pyrite with Au
CHANG Weijun (Department of Geology, University of Western Australia)WEI Chengqian, ZHANG Jinping, ZHANG Wanjing (Department of Chemistry, Peking University)
The fine structure of Pyrite type were worked out by means of polycrystalline diffractometry and Rietveld profile analysis refinement. We used twenty samples about two kinds of Pyrite with gold and without. The space group is Th6-Pa3. The average value of lattice parameters for the two kinds of samples are almost equal but the coordinations of S atom are no equal obviously, x3 = 0.3849 for the former x3= 0.3868 for the latter. From the coordinations we have derived lengths for Fe-S and S-S bonds as well as calculated atomic valences for Fe by bond valence theory.The lengths is shorter for Fe-S bond and longer for S-S, the atomic valence for Fe is higher in the sample with gold. In the most of the samples the occupancy of Fe deviates from unity. So the Pyrite type can tolerate such imperfect as variety of atomic valence and vacancy. So far as the fine structure is concerned the Pyrite type should be a series of forms containing different imperfect structure. In the Pyrite with gold high valence state for Fe imply that Au3+ or Au+ ions migrete into thermal liquid containing Fe2+ and S22- and are reduced to Au by Fe2+, co-depositing down with FeS2, in dispersing at outside of the Pyrite lattice.
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