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Optical properties of olivines from Ubekendt Island, west Greenland

Published online by Cambridge University Press:  14 March 2018

P. M. Game
P. M. Game*
Affiliation:
Mineral Department of the British Museum
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Extract

The olivines, which are the subject of this note, were obtained from a series of basaltic lavas and dikes on Ubekendt island, which lies off the west coast of Greenland in latitude 71 ° N., longitude 54 ° W.

The optical properties of the olivines were investigated in order to determine any range in composition; such variations might have been expected in the very thick lava series. From this aspect, however, the results are disappointing, the composition range being small. However, it is thought that the results may have a certain interest in showing the relative accuracy obtainable in the measurement of refractive indices and optic axial angles. The usual determinative methods have been slightly varied. It is the purpose of this note to describe these variations and to compare the relative speed and scope of the method used with those obtained by other methods.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 172 , March 1941 , pp. 11 - 15
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1941

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