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X-ray data, optical anisotropism, and thermal stability of cobaltite, gersdorffite, and ullmannite

Published online by Cambridge University Press:  05 July 2018

P. Bayliss
P. Bayliss*
Affiliation:
School of Applied Geology, University of New South Wales
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Summary

Data are presented from cobaltite (CoAsS), gersdorffite (NiAsS), and ullmannite (NiSbS) for cell size, compositional zoning, mineralogical association, X-ray diffraction powder intensities, and optical anisotropy. The presence of powder X-ray diffraction reflections 001 and 011 are related to the crystal structure type. The amount of distortion from cubic symmetry is related to the 001 reflection intensity and also to the optical anisotropism strength. These properties are related approximately to the thermal stability of the distorted crystal structure. This thermal stability increases with the substitution of cobalt for nickel, which decreases the cell size. An order-disorder change occurs before the distortion release in non-cubic gersdorffite (P1) with a large cell size, whereas only a distortion release is observed in cobaltite (Pca21) and non-cubic gersdorffite (P1) with a small cell size. Glaucodot (Co,Fe)AsS converted to cobaltite at 620 C. No evidence was found to relate optical anisotropism of pyrite to deviations from cubic symmetry.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 285 , March 1969 , pp. 26 - 33
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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Footnotes

1

Present address : Department of Geology, University of Calgary, Alberta.

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