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Corundum in Biotite-Sillimanite Gneiss From near Polgahawela, Ceylon

Published online by Cambridge University Press:  01 May 2009

P. G. Cooray  and
P. S. Kumarapeli
P. G. Cooray
Affiliation:
Department of Mineralogy, Geological Survey of Ceylon, Colombo, Ceylon. Department of Geology, Imperial College of Science and Technology, London. (P. G. C.)
P. S. Kumarapeli
Affiliation:
Department of Mineralogy, Geological Survey of Ceylon, Colombo, Ceylon. Department of Geology, Ceylon Technical College, Colombo. (P. S. K.)
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Abstract

Idiomorphic, pale blue corundum crystals (S.G. =4·02, n0=1·770 ± 0·002) up to one inch long occur as porphyroblasts in a finegrained biotite-sillimanite gneiss cut by pegmatite veins at Gangoda, 5½ miles south of Polgahawela. The field relations and petrography of the corundum-bearing rocks are described briefly. The corundum is thought to have crystallized by metamorphic differentiation in alumina-rich silica-poor bands in a semipelitic gneiss.

Type
Articles
Information
Geological Magazine , Volume 97 , Issue 6 , December 1960 , pp. 480 - 487
Copyright
Copyright © Cambridge University Press 1960

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References

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