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The Nephelinite of Etinde, Cameroons, West Africa

Published online by Cambridge University Press:  01 May 2009

C. E. Tilley
C. E. Tilley
Affiliation:
Department of Mineralogy and Petrology, Cambridge.
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Abstract

Re-examination of the nephelinites of Etinde, Cameroons, carrying a composite structured “nepheline” mineral shows that the feldspathoid is a genuine nepheline, in part exhibiting twinned intergrowths, and not a potassic orthorhombic feldspathoid phase. Analysis indicates a composition with a mol. ratio of 3·6. Comparison is made with other nephelines in contrasted host environments.

Type
Articles
Information
Geological Magazine , Volume 90 , Issue 3 , June 1953 , pp. 145 - 151
Copyright
Copyright © Cambridge University Press 1953

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References

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