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A suite of volcanic rocks from south-west Uganda containing kalsilite (a polymorph of KAlSiO4)

Published online by Cambridge University Press:  14 March 2018

Arthur Holmes
Arthur Holmes*
Affiliation:
University of Durham
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Extract

During the last few years large collections of rock specimens from the Toro-Ankole volcanic fields, east and south-east of Ruwenzori, have been sent to Durham by the Geological Survey of Uganda for petrological investigation. The specimens recently studied include representatives of a suite of highly potassic ultrabasic lavas. Some of these resemble melanocratic olivine-nephelinites or olivine-rich ankaratrites, but the nepheline-like felspathoid which they contain, instead of being nepheline, is a polymorph of KAlSiO4. For chemical reasons this mineral was at first thought to be kaliophilite. Other types, closely related, contain leucite, biotite, or melilite, in addition to the supposed kaliophilite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 177 , June 1942 , pp. 197 - 217
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1942

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