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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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References

De Leenheer, (L.), 1950. Ann. Serv. Mines, Com. Spec. Katanga, 15, 1.Google Scholar
Deuens, (M.), 1972. Thèse de doctorat.Google Scholar
Frenzel, (A.), 1872. Jonrn. prakt. Chem. new scr. 5, 404.Google Scholar
Hey, (M. H.), 1962. Min. Mag., 33, 253–9 [M.A. 16—173].Google Scholar
[Kondrashev, (Yu. D.), and Fedorova, (N. N.)] 1954. CCCP (Compt. Rend. Acad. Sci.URSS) 94, (2) 229-31.Google Scholar
Ramdohr, (P.), 1969. The ore minerals and their intergrowths. Oxford (Pergamon Press).Google Scholar
Schoep, (A.) and Cuveuer, (V.), 1929. Bull. Soc. beige Geol., 39, 74 [M.A. 4-347].Google Scholar