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Almandine from Botallack, Cornwall

Published online by Cambridge University Press:  14 March 2018

A. R. Alderman
A. R. Alderman*
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

Well-Crystallized icositetrahedral garnets from Botallack, Cornwall, are preserved in most British mineral collections, but they have previously not been systematically examined. The original specimens were discovered in 1821 by a St. Just miner who dealt in minerals, and the occurrence is first referred to by Carne in his paper 'On the mineral productions and the geology of the parish of St. Just' as follows : 'About six months ago, a mass of beautiful garnets, of a deep red colour, was found imbedded in the rock, not far from low water mark at the foot of Chycornish Carn, about a quarter of a mile south of Botallack. Some of the crystals were larger than hazel-nuts, and most of them were twenty-four sided. Some specimens of a very superior order were procured, each having from one to two hundred crystals on its face.'

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 24 , Issue 148 , March 1935 , pp. 42 - 48
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1935

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References

Page 42 Note 1 Carne, J., Trans. Roy. Geol. Soc. Cornwall, 1822, vol. 2, p. 309.Google Scholar

Page 42 Note 2 Near low water mark on the cliffs close to Zawn a Bal, between the Crowns and Wheal Edward.

Page 43 Note 1 Tilley, C. E. and Flett, J. S., Summary of Progress, Geol. Surv. of Great Britain, 1930, for 1929, pp. 24-40.Google Scholar [Min. Abstr., vol. 4, p. 402.]

Page 43 Note 2 The specimen analysed was from the S. G. Perceval collection in the Department of Mineralogy and Petrology, Cambridge.

Page 45 Note 1 Other analyses, having a somewhat lower percentage of almandine, but which are for various reasons unsatisfactory for purposes of comparison, are recorded as follows :

Wicklow, Ireland. Mallet, J. W., Journ. Geol. Soc. Dublin, 1850, vol. 4, p. 275.Google Scholar

Redding, Connecticut. Anal. Sperry, F. L. in Ford, W. E., Amer. Journ. Sci., 1915, ser. 4, vol. 40, p. 34.Google Scholar

Brena, Sweden. Anal. Bahr, J. F., Öfvers. Vetenskaps-Akad. Stockholm, 1845, vol. 1 (for 1844), p. 93.Google Scholar

Page 45 Note 2 Gossner, B., Beitrag zur Stöchiometrie der Silicate. Zeits. Angewandte Chem., 1929, vol. 42, pp. 175-178.CrossRefGoogle Scholar [M.A. 4-198.] Also Gossner, B. and Ilg, E., Centralbl. Min., Abt. A, 1932, pp. 1-12.Google Scholar [M.A. 5-528.]

Page 47 Note 1 Machatschki, F., Zeits. Krist., 1930, vol. 73, pp. 133,Google Scholar 134. [M.A. 4-277.]

Page 47 Note 2 Borgström, L. H., Compt. Rend. Soc. Géol. Finlande, 1929, no. 2, p. 3.Google Scholar [M.A. 4-449.]

Page 48 Note 1 Ford, W. E., Amer. Journ. Sci., 1915, ser. 4, vol. 40, p. 42.Google Scholar [M.A. 2-37.]

Page 48 Note 2 Eskola, P., On the eclogites of Norway. Vidensk. Skrift. Kristiania, 1921, no. 8, p. 9.Google Scholar [M.A. 2-313.]