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Plagioclases from Sultan Hamud, Kenya

Published online by Cambridge University Press:  14 March 2018

P. M. Game
P. M. Game*
Affiliation:
Department of Mineralogy, British Museum
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Extract

The plagioclase which forms the subject of this investigation was presented by Dr. C. Stansfield Hitchen, director of the Kenya Geological Survey, who has kindly sent the following note of its occurrence:

‘The pale-green transparent felspar described in this note was found on the western slopes of a hill named Kioo, about 14 miles due north of Sultan Hamud station, Machakos district, Kenya Colony. From a description given by Messrs. D. Lyall and P. Cull, who found the mineral, it appears to have occurred in a small vein-like pegmatite sandwiched between parallel plates of decomposing mica. Towards the periphery of the enclosing mica plates the transparent felspar graded into opaque cream-coloured felspar of more normal appearance. The clear material was somewhat shattered and broke with many fragments on removal. The occurrence suggests a deuteric or possibly hydrothermal origin. Kyanite-gneisses occur in the vicinity.’

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 206 , September 1949 , pp. 682 - 687
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1949

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References

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