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Re-investigation of clino-ferrosilite from Lake Naivasha, Kenya

Published online by Cambridge University Press:  14 March 2018

M. G. Bown
M. G. Bown*
Affiliation:
Department of Mineralogy and Petrology, Cambridge
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Summary

The clino-ferrosilite from the lithophysae in an obsidian from Lake Naivasha, Kenya, originally examined by Bowen (1935), has been shown to be substantially pure FeSiO3, with about 5% MnSiO3 in solid solution. It has the same space-group, P21/c, as clino-enstatite and pigeonite. The unit-cell dimensions are a = 9.718 Å, b = 9·088 Å, c = 5·239 Å, β = 108° 27′. These do not conform to the scheme proposed by Brown (1960): reasons are given why this was not unexpected.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 66 - 70
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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