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Genthelvite and bertrandite from the Cairngorm Mountains, Scotland

Published online by Cambridge University Press:  14 March 2018

W. C. Morgan
W. C. Morgan*
Affiliation:
Department of Geology, The University, Newcastle upon Tyne
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Summary

A zinc-rich helvine (genthelvite) has been found with bertrandite in miarolitic cavities in adamellite at Coire an Lochain in the Cairngorm Mountains. The genthelvite occurs as green or brown tetrahedral crystals of sp. gr 3·58±0·01. It is isotropic, n 1·742±0·003, a 8·133±0·005 Å. Bertrandite crystals are pale brown with sp. gr. 2·60±0·01; biaxial negative with 2V 75°, and α 1·590, β 1·603, γ 1·613, all ±0·003.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 277 , March 1967 , pp. 60 - 63
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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