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The crystal structure of gersdorffite (III), a distorted and disordered pyrite structure

Published online by Cambridge University Press:  14 March 2018

P. Bayliss  and
N. C. Stephenson
P. Bayliss
Affiliation:
School of Applied Geology, University of New South Wales, Kensington, New South Wales
N. C. Stephenson
Affiliation:
School of Applied Geology, University of New South Wales, Kensington, New South Wales
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Summary

The crystal structure of gersdorffite (III) has been examined with three-dimensional Weissenberg X-ray diffraction data. The unit cell is isometric with a 5·6849 ± 0·0003 Å, space group PI, and four formula units per cell. This structure has the sulphur and arsenic atoms equally distributed over the non-metal atom sites of pyrite. All atoms show significant random displacements from the ideal pyrite positions to produce triclinic symmetry, which serves to distinguish this mineral from a disordered cubic gersdorffite (II) and a partially ordered cubic gersdorffite (I). Factors responsible for the atomic distortions are discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 283 , September 1968 , pp. 940 - 947
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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