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Some orthopyroxenes from Scottish metamorphic rocks

Published online by Cambridge University Press:  14 March 2018

R. A. Howie
R. A. Howie*
Affiliation:
Department of Geology, King's College, London
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Summary

Chemical analyses, cell parameters, and optical properties are presented for seven Scottish orthopyroxenes: four from Harris, two from Scourie, and one from Belhelvie, Aberdeenshire. The compositions range from En83·6 to En55·5. Six of the orthopyroxenes are from pyroxene granulites or related rocks and the other is from a plagioclase-hypersthene hornfels: the latter mineral is notable in having 7·21% Al2O3, causing a considerable contraction in the a and b cell parameters. The alumina content of orthopyroxenes is briefly discussed. Analyses are also given for olivine and diopsidic augite from a South Harris ultrabasic gneiss and for two enderbitic pyroxene gneisses from Scourie.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 265 , June 1964 , pp. 903 - 911
Copyright
Copyright © 1964, The Mineralogical Society

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