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Composition and orientation of clinopyroxene lamellae in Bushveld-type orthopyroxene from the Greenhills ultramafic complex, Bluff Peninsula, Southland, New Zealand

Published online by Cambridge University Press:  05 July 2018

D. J. Mossman
D. J. Mossman*
Affiliation:
Geology Department, University of Otago, Dunedin, New Zealand
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Summary

Identification of clinopyroxene lamellae in Bushveld-type orthopyroxene from the Greenhills Ultramafic Complex has been made on the basis of partial analysis by electron microprobe as well as by unit cell determination by prolonged exposure to X-rays of single crystals of orthopyroxene. Lamellae averaging Ca42Mg47Fe11 in composition with an approximate unit cell a 9·79, b 8·90, c 5·29 Å, β 106° 14′, occur in orthopyroxene Ca2Mg67Fe31 with unit cell a 18·28, b 8·85, c 5·20 Å. The Greenhills lamellae are of orientation identical to those described by Hess (1960), which share c and b axes with host orthopyroxene.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 294 , June 1971 , pp. 160 - 164
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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Footnotes

1

Present address: Dept. of Geological Sciences, University of Saskatchewan, Saskatoon.

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