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On sulphatic cancrinite and analcime (eudnophite) from Loch Borolan, Assynt

Published online by Cambridge University Press:  14 March 2018

F. H. Stewart
F. H. Stewart*
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

The minerals to be described in this paper were collected, in conjunction with W. E. Fraser, who was carrying out a detailed study of the borolanite, from the road-metal quarry, opened in 1938, at Allt a' Mhuillin, Loch Borolan, Assynt, Scotland. They occur in pegmatitic patches and veins in borolanite.

This mineral is one of the chief constituents of the pegmatites. It forms large cleavable masses, associated with orthoclase, melanite, and a little dark mica. Calcite, sphene, zircon, and orthite are present as accessories. It often fills interstices between crystals of orthoclase. A preliminary examination has indicated that it is a common constituent of the spots in some types of borolanite, and further work will have to be done to determine its importance in this connexion. This is the first definite record of the occurrence of cancrinite in Britain.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 172 , March 1941 , pp. 1 - 8
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1941

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