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On the Pinite of Breage in Cornwall

Published online by Cambridge University Press:  14 March 2018

J. H. Collins
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Extract

It has long been known that several of the felspar-porphyry dykes (Elvans) of the West of Cornwall contain crystals of pinite--apparently pseudomorphous after iolite--as an accessory mineral, and similar crystals occur.in the granite in several places.

In the parish of Breage there are several of these dykes running towards the sea in a south-easterly direction, which are somewhat largely used as road-material. That which reaches the sea at Praa is in places thickly charged with the pinite crystals, and the same in a somewhat less degree may be said of the dyke which passes from the village of Trew through Great Wheal Fortune.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 10 , Issue 45 , July 1892 , pp. 8 - 9
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1892

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References

1 See the Author's "Handbook to the Minerology of Cornwall and Devon," 1876, and Mr. A. K. Bamett's "Observations on the Elvans, &c., of Cornwall."