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Colour in charnockites

Published online by Cambridge University Press:  14 March 2018

R. L. Oliver  and
P. K. Schultz
R. L. Oliver
Affiliation:
Department of Geology, University of Adelaide, South Australia
P. K. Schultz
Affiliation:
Australian Mineral Development Laboratories, Frewville, South Australia
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Summary

Microprobe analysis of leached and unleached varieties of a charnockitic rock from Madras supports the contention of Howie (1964) that the characteristic dark greenish colour of such rocks is contained mainly in fine (chloritic ?) veinlets cutting the feldspar and quartz, though a certain amount appears to be contained in exsolved sodium feldspar. Leaching of the darkish colour of the charnockitic rock has not affected the crystallographic state of the potassium feldspar.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 284 , December 1968 , pp. 1135 - 1138
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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References

Howie, (R. A.), 1964. Science progress, vol. 52, p. 628 [M.A. 17-337].Google Scholar
Howie, (R. A.), 1967. Journ. Geol. Soc. India, vol. 8, p. 1.Google Scholar