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Dravite-bearing rocks from Dinas Head, Cornwall

Published online by Cambridge University Press:  14 March 2018

S. O. Agrell
S. O. Agrell*
Affiliation:
Department of Geology, Victoria University of Manchester
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Extract

In a previous paper describing the geological and petrographical details of the adinoles of Dinas Head, short references were made to the common occurrence among the adinoles and associated rock-types of the magnesia-rich tourmaline, dravite. It is proposed now to describe these tourmaline-rich rocks in more detail and to discuss the question of their origin.

Adinoles with accessory tourmaline occur wherever true adinoles are developed at Dinas Head, although tourmaline is characteristically absent from types 2 a, b, c, and 3 [1, pp. 318–323]. Bands with up to 30 % tourmaline occur interbanded with normal adinoles of type 1 and with certain spilosites.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 174 , September 1941 , pp. 81 - 93
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1941

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