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A simple method for the measurement of the refractive indices of the felspars

Published online by Cambridge University Press:  14 March 2018

Olive Robins
Olive Robins*
Affiliation:
Geology Department, King's College, University of London.
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Extract

The method described is one that can be used to measure the refractive indices of minerals when no refractometer is available. The readings are consistent to ±0·002 and are in reasonable agreement with those obtained using a refractometer.

The principle of the method is to mix two liquids with different refractive indices. One of these is a typical immersion liquid with a very low volatility. It must have a refractive index greater than that of the mineral under investigation. The other, more volatile liquid has a refractive index less than that of the mineral. The two liquids selected must be miscible in all proportions, but must not react together. The mineral is completely immersed in a mixture of the two liquids.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 202 , September 1948 , pp. 367 - 373
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1948

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