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The petrographic use of the spindle stage and focal-plane screening in the determination of the optical variation of some zoned minerals

Published online by Cambridge University Press:  14 March 2018

Hedley G. Wright
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Summary

The Equivibration Curve technique of Joel (1963) is used to determine the orientation of a zoned mineral on the spindle stage axis and an average value for 2V. A bracketing method enables the extreme values of each refractive index to be determined for sodium light on a single grain, using the Focal-plane Screening technique of Cherkosov (1960).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 272 , December 1965 , pp. 656 - 660
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

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