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Study of minerals from the pegmatites of the Nellore mica-belt, Andhra Pradesh, India Part III—Biotite

Published online by Cambridge University Press:  05 July 2018

V. R. R. M. Babu
V. R. R. M. Babu*
Affiliation:
Department of Geology, Andhra University, Waltair
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Summary

The biotites in the pegmatites are Fe2+ type. X-ray analyses indicated that they are 1M or 3T polymorphs. In the colour of the biotite iron plays an important role. From the Fe/(Fe+Mg) ratios, the analysed biotites are assumed to have crystallized between 760 and 500 °C.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 391 - 393
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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