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Prehnite from the Lizard district, Cornwall

Published online by Cambridge University Press:  14 March 2018

Arthur Russell
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Extract

Hitherto the mineral prehnite has been recorded from one locality only in Cornwall, namely, in the cliffs between Wheal Cock and the Crowns Rock, Botallack, St. Just. It occurs there as pale-green, globular aggregates composed of indistinct, curved crystals, and forms veins traversing a narrow strip of greeustone which has intruded itself through the granite mass; associated minerals are stilbite and axinite.

In the summer of 1910 the writer collected several crystallized specimens of this mineral at Pare Bean Cove, Mullion, the locality from which Dr. J.S. Flett and Mr. W. F. P. McLintock obtained the fine crystallized specimens of datolite, recently described by the latter. The prehnite occurs here in two distinct and somewhat unusual types of crystals—tabular and prismatic.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 75 , May 1912 , pp. 217 - 218
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1912

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References

Page 217 note 1 Carne, Joseph, ‘On the mineral productions, and the geology of the parish of St. Just,’ Trans. R. Geol. Soc. Cornwall, 1822, vol. ii, pp. 290–358 Google Scholar (Prehnite on p. 310). Compare Russell, A., Mineralogical Magazine, 1919, vol. xv, p. 379 Google Scholar.

Page 217 note 2 McLintock, W. F. P., ‘On datolite from the Lizard district, Cornwall,’ Mineralogical Magazine, 1910, vol. xv, pp. 407–414 CrossRefGoogle Scholar.

Page 218 note 1 The form u{301} has hitherto been recorded only on crystals of prehnite from Josvas copper mine, Julianehaab district, Greenland.—O. B. Böggild, ‘Mineralogia Groenlandics,’ 1905, p. 292.