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A new universal stage extinction technique: the determination of 2 V when neither optic axis is directly observable

Published online by Cambridge University Press:  14 March 2018

F. E. Tocher
F. E. Tocher*
Affiliation:
Department of Geology and Mineralogy, University of Aberdeen
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Summary

A new universal stage extinction technique is presented. It is based on the special case of coplanar and conical extinction curves where an optic axis lies on the wave-normal locus. It may be used in favourable circumstances to determine 2V when neither optic axis is directly observable.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 266 , September 1964 , pp. 1038 - 1054
Copyright
Copyright © 1964, The Mineralogical Society

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