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Porphyroblastic adularia from Shimabala, Zambia

Published online by Cambridge University Press:  14 March 2018

D. I. J. Mallick
D. I. J. Mallick*
Affiliation:
Department of Geology, University of Durham
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Summary

An unusual occurrence of adularia as a porphyroblastic mineral in an Upper Pre-Cambrian marble from Zambia is described, and optical and chemical data given. The presence of good cleavages oblique to the crystal faces indicates that the latter are hemi-orthodomes and high index pyramids, although the crystals are of simple form.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 401 - 407
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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