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Ferriferous orthoclase from Madagascar

Published online by Cambridge University Press:  14 March 2018

D. S. Coombs
D. S. Coombs*
Affiliation:
Geology Department, University of Otago, New Zealand
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Extract

In 1916 Kôzu recorded the fact that a specimen of yellow Madagascar orthoclase, subsequently shown by Seto (1923) to contain 2-93% Fe203, had an optic axial angle of 20° 17' (NaD light) with the optic axial plane parallel to (010). This observation is in apparent conflict with the useful curves relating 2V to composition for alkali-felspars compiled by Dr. O. F. Turtle (1951, 1952). These curves were designed to show how the felspars fall into several more or less distinct series, rather than as an aid to the precise determination of composition, which in fact must be decided by other means. The possibility of transitional forms between the series was clearly recognized (e.g. 1952, p. 565).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 226 , September 1954 , pp. 409 - 427
Copyright
Copyright © 1954, The Mineralogical Society

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