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Carminite and beudantite from the northern part of the Lake District and from Cornwall

Published online by Cambridge University Press:  14 March 2018

Arthur W. G. Kingsbury
Affiliation:
Dept. of Mineralogy, University Museum, Oxford
J. Hartley
Affiliation:
Dept. of Geology, University of Leeds

Summary

The parageneses are given of ten new occurrences of carminite [PbFe2(AsO4)2(OH)2] and eleven of beudantite [PbFe3AsO4SO4(OH)6] in Cornwall and Cumberland, with an account of the alteration of carminite to beudantite and of beudantite to plumbojarosite or to beaverite.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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References

page 423 note 1 Russell, A., Min. Mag ., 1910, vol. 15, p. 255.Google Scholar

page 423 note 2 Kingsbury, A. W. G., Trans. Roy. Geol. Soc, Cornwall, 1954, vol. 18, part 4 (for 1952), p. 395 Google Scholar.

page 423 note 3 Ibid., p. 392.

page 425 note 1 Dana, Syst. Min., 7th edn, vol. 2, p. 556.;

page 426 note 1 Simpson, E. S., Journ, Roy. Soc. Western Australia, 1938, vol. 240, p. 110.Google Scholar

page 426 note 2 Syst. Min., 7th edn, vol. 2, p. 1002.

page 426 note 3 Bull. Soc. Franç. Min. Crist., 1952, vol. 75, p. 70 [M.A. 12-68].

page 427 note 1 Butler, and Schaller, , Journ. Wash. Ac. Sci., 1911, vol. 1, p. 26; Amer. Journ. Sci., 1911, ser. 4, vol. 32, p. 418.Google Scholar

page 427 note 2 See also Kingsbury, A. W. G. and Hartley, J., Min. Mag., 1956, vol. 31, p. 289, and 1957, vol. 31, p. 700.Google Scholar

page 427 note 3 In Grains Gill several east-west 'lead-veins' also heave and shift to the left the main' granite' veins; later quartz-carbonate veins cross and heave them to the right.

page 428 note 1 Driven alongside the vein where it outcrops and crosses the Dry Gill beck.

page 431 note 1 Kingsbury, A. W. G., Trans. Roy. Geol. Soc. Cornwall, vol. 18, part 4 (1952), p. 396 Google Scholar. A sample of this material, examined shortly after collection, was shown to be zeunerite, with n 1.608±0.001 and giving X-ray powder-pattern spacings almost identical with those for synthetic hydrous zeunerite given by Weiss-Frondel, J. in Amer. Min., 1951, vol. 36, p. 252 Google Scholar, and distinct from those of meta-zeuncrite with 5-8 H2O.

page 431 note 2 Representative specimens of most of the above occurrences have been given to the Department of Mineralogy, British Museum (Natural History).