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The Pendennis peralkaline minette

Published online by Cambridge University Press:  05 July 2018

A. Hall
A. Hall*
Affiliation:
Department of Geology, King's College, Strand, London WC2R 2LS
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Abstract

The Pendennis minette has an exceptionally high K2O/Na2O ratio and is strongly peralkaline. Its constituent minerals, which are described in detail, are sanidine, biotite, two carbonates (dolomite and ferroan magnesite), two amphiboles (riebeckite and a new variety, potassium magnesio-arfvedsonite), and quartz. The major and trace dement composition of the minette indicates close affinities with the lamproitic lavas.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 257 - 266
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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