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An electron-microscope study of peristerite plagioclases

Published online by Cambridge University Press:  14 March 2018

S. G. Fleet  and
P. H. Ribbe
S. G. Fleet
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
P. H. Ribbe
Affiliation:
Crystallographic Laboratory, Cavendish Laboratory, University of Cambridge, and Department of the Geophysical Sciences, University of Chicago
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Summary

Plagioclase feldspars in the peristerite range An2-An17 have been investigated by transmission electron-microscopy and electron diffraction. All except the more anorthite-rich specimens were found to be unmixed into albite and oligoclase lamellae, between a few hundred and several thousand Å thick and approximately parallel to . A discussion is given of the part played by these lamellae when optical schiller is exhibited; and the effect of heat treatment on the lamellar structure and optical schiller is described.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 269 , March 1965 , pp. 165 - 176
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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