Some orthopyroxenes from Scottish metamorphic rocks
- 1 June 1964
- journal article
- Published by Mineralogical Society in Mineralogical Magazine and Journal of the Mineralogical Society
- Vol. 33 (265) , 903-911
- https://doi.org/10.1180/minmag.1964.033.265.06
Abstract
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.Keywords
This publication has 3 references indexed in Scilit:
- XVIII.—The Geochemistry of the Charnockite Series of Madras, IndiaTransactions of the Royal Society of Edinburgh, 1955
- The gabbroic complex of Belhelvie in AberdeenshireQuarterly Journal of the Geological Society, 1946
- XX.—Geology of the Outer Hebrides. Part IV.—South HarrisTransactions of the Royal Society of Edinburgh, 1927