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Zinc-bearing chromite (donathite?) from Norway: a second look

Published online by Cambridge University Press:  05 July 2018

Alan C. Moore
Alan C. Moore*
Affiliation:
Mineralogisk-Geologisk Museum, Sars Gate 1, Oslo 5, Norway
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Summary

Electron-microprobe analyses of chromites from the Helgeland area, Norway, show that they are all low in zinc. Many chromites show physical properties identical with donathite (anisotropism; polar magnetism) but have cubic lattices. One exception, from Rødøya, shows an unusual deviation from cubic symmetry and that there may exist complex intergrowths of two different tetragonal lattices and a cubic lattice. The similarity between the chromites studied and donathite suggests that the chemistry and crystallography of that mineral may be more complex than is currently accepted.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 319 , September 1977 , pp. 351 - 355
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Present address: Dept. of Geology, University of Cape Town, Rondebosch 7700, South Africa.

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