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Optical data on some authigenic feldspars from Western Australia

Published online by Cambridge University Press:  05 July 2018

J. E. Glover  and
P. Hosemann
J. E. Glover
Affiliation:
Department of Geology, University of Western Australia, Nedlands, Western Australia
P. Hosemann
Affiliation:
West Australian Petroleum Pty. Ltd., Box C1580, G.P.O., Perth, Western Australia
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Summary

Authigenic envelopes up to 0·18 mm thick on clastic potassium feldspar grains from arkoses and subgreywackes of the Devonian Nannyarra Greywacke have been examined with the four-axis universal stage. The plane of the optic axes is parallel to (010) in some segments of individual envelopes and normal to (010) in others, and the range of 2Vα over all envelopes is from close to 0° to 65°. The optics are ascribed to modifications of potassium feldspar corresponding to high-and low-sanidine and orthoclase.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 588 - 592
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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