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- W2186029721 abstract "Thirteen gersdorffite (NiAsS) specimens were analyzed with electron microprobe, powder diffraction, and precession camera techniques. For each specimen, a sample with a well-developed cube form {lOO}was selected. Intensity data were collected from 27 reflections, which are mostly forbidden by cubic space group Pa3, with a single crystal diffractometer. X-ray powder diffraction data indicate two pyrite subgroup specimens, five ullmannite subgroup specimens, and six cobaltite subgroup specimens. A complete intensity data set was collected by single crystal diffractometer from three of these six cobaltite subgroup samples. Least-squares refinement shows different degrees of apparent As-S disorder with one sample significantly ordered (predominantly three twin-related domains) and the other two samples disordered (equal amounts of six twin-related domains). These three crystal structures are similar to those described for cobaltite. They are explained as a sextuplet of orthorhombic (Pca2t) interpenetrating twin-related domains about a 3 twin axis [111]. Although the chemical compositions of the three different pyrite-type crystal structures overlap, there is a tendency for the two pyrite subgroup (true As-S disorder at the atomic level, Pa3) specimens to contain more As, and a tendency for the six cobaltite subgroup (true As-S order at the atomic level, Pca2t) specimens to contain more Co and Fe than the five ullmannite subgroup (true As-S order at the atomic level, P2t3) specimens. These three crystal structures are probably temperature dependent with P2t3 the low form, Pca21 the intermediate (metastable?) form, and Pa3 the high form." @default.
- W2186029721 created "2016-06-24" @default.
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- W2186029721 date "1982-10-01" @default.
- W2186029721 modified "2023-09-26" @default.
- W2186029721 title "A further crystal structure refinement of gersdorffite" @default.
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