No CrossRef data available.
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
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