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Polytypism of heterogenite

Published online by Cambridge University Press:  05 July 2018

M. Deliens  and
H. Goethals
M. Deliens
Affiliation:
Musée royal de l'Afrique centrale, Tervuren, Belgium
H. Goethals
Affiliation:
Laboratorium van Mineralogie, K.U.L., Leuven, Belgium
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Summary

A new variety of heterogenite was found in samples from Mindigi, Shaba, Zaïre. Photometric reflectance varies from 0·235 to 0·165 at λ 5890 Å in air. The bireflectance is 0·070, the degree of anisotropy is 0·7 and the main index in air is 2·7. A thermal weight-loss curve and a microprobe analysis are given and discussed, indicating the formula (Co,Ni) O.OH.

The new variety, referred to as heterogenite-H, is hexagonal with cell dimensions a 2·85, c 8·80, space group P63/mmc and cell-content 2 [(Co, Ni)O.OH)]. Indexed X-ray powder data are given. A crystal structure is suggested based on CoO.OH octahedra layers and indicating a polytypic relation between heterogenite-H, the 2H form, and normal heterogenite, the 3R form.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 152 - 157
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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