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A note on the 01 spacing of some lime-rich alkali feldspars from Kangerdlugssuaq, East Greenland

Published online by Cambridge University Press:  14 March 2018

D. R. C. Kempe
D. R. C. Kempe*
Affiliation:
Department of Geology and Mineralogy, Parks Road, Oxford
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Summary

The values of 2θ 01 for some homogenized lime-rich fine microperthites from the Kangerdlugssuaq alkaline intrusion, East Greenland, are investigated and found to be consistently high when compared with the values used in the standard curves for estimating the Or content of alkali feldspars. This deviation, which is approximately proportional to anorthite content, results in anomalously low Or percentages being obtained and is ascribed to a distortion of the structure due to the unusually high calcium content of the microperthites.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 273 , March 1966 , pp. 704 - 714
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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