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The determination of the orthoclase content of homogenized alkali feldspars using the 2̄01 X-ray method

Published online by Cambridge University Press:  05 July 2018

J. B. Jones ,
R. W. Nesbitt  and
P. G. Slade
J. B. Jones
Affiliation:
Department of Geology, The University of Adelaide, Adelaide, South Australia, 5001
R. W. Nesbitt
Affiliation:
Department of Geology, The University of Adelaide, Adelaide, South Australia, 5001
P. G. Slade
Affiliation:
Department of Geology, The University of Adelaide, Adelaide, South Australia, 5001
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Summary

Forty-three natural alkali feldspars have been homogenized and used to correlate with wt % K2O. The regression of Or on is Or (wt %) = 465·5 (Å)-1877·5, and is comparable to that obtained on an exchanged orthoclase (Wright, 1968). A deviation from the Orville (1963, 1967) determinative line for synthetic sanidine-albite is greatest at the high potassium end of the series. The discrepancy is not caused by failure to homogenize or incomplete disorder. The presence of cations other than potassium and sodium, or cation deficiency, or both cannot be discounted as a cause.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 288 , December 1969 , pp. 489 - 496
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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Footnotes

1

Present address: C.S.I.R.O. Division of Soils, Adelaide.

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