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Bustamite from Treburland manganese mine, Cornwall, and its paragenesis. (With Plate XV)

Published online by Cambridge University Press:  14 March 2018

C. E. Tilley
C. E. Tilley*
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

Bustamite forms an important constituent of the manganese ores of the Treburland mine near Altarnun, Cornwall. The rediscovery of this mineral locality is due to Sir Arthur Russell, who has already presented an account of the rhodonite and tephroite of the mine (Proc. Min. Soc. 1944, p. xix). Since then the writer has noted bustamite and bementite from the same locality (ibid. 1944, p. xxvi), and it is the purpose of the present paper to discuss the composition and paragenesis of this bustamite.

Rhodonite and tephroite form the chief silicate constituents of the manganese ores exposed On the dumps adjacent to the old Treburland mine shaft, but bustamite-bearing assemblages are not uncommon.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 27 , Issue 194 , September 1946 , pp. 236 - 241
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1946

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References

page 236 note 1 Sundius, N., Amer. Min., 1931, vol. 16, pp. 411–429, 488–518. [M.A. 5–143.]Google Scholar

page 236 note 2 Tilley, C. E., Min. Mag., 1937, vol. 24, pp. 569–572.CrossRefGoogle Scholar

page 238 note 1 Hey, M. H., Min. Mag., 1929, vol. 22, pp. 193–205.CrossRefGoogle Scholar

page 238 note 2 Bowen, N. L., Schairer, J. F., and Posnjak, E., Amer. Journ. Sci., 1933, ser. 5, vol. 26, pp. 271,275. [M.A. 5–454.]Google Scholar

page 238 note 3 Schaller, W. T., Amer. Min., 1939, vol. 23, p. 575. [M.A. 7–222.]Google Scholar

page 239 note 1 This observation in an endogeneous contact-zone (Scawt Hill) has now been extended to a contact skarn carrying iron-wollastonites associated with hedenbergites.

page 232 note 1 The calcite phase is more strictly a solid solution containing small amounts of MnCO3.