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Cymrite, a new barium mineral from the Benallt manganese mine, Rhiw, Carnarvonshire

Published online by Cambridge University Press:  14 March 2018

W. Campbell Smith ,
F. A. Bannister  and
Max H. Hey
W. Campbell Smith
Affiliation:
Department of Mineralogy, British Museum
F. A. Bannister
Affiliation:
Department of Mineralogy, British Museum
Max H. Hey
Affiliation:
Department of Mineralogy, British Museum
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Extract

Among the specimens collected at the Benallt manganese mine in 1944 by Dr. A. W. Groves and myself was one (B.M. 1944,48) from the 60-foot level in no. 1 ore-body which showed on a face of dark, compact manganese ore colourless plates up to 7 mm. across and about ½ mm. thick. These plates proved to be uniaxial and negative with perfect basal cleavage. Heated in an ignition tube the fragments decrepirated, gave off water, and became pearly, white, and opaque. Qualitative tests showed Ba, Al, and SiO2 to be present. Preliminary X-ray photographs revealed hexagonal symmetry, but could not be matched with those of any known mineral.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 206 , September 1949 , pp. 676 - 681
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1949

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References

page 679 note 1 Bannister, F. A., Pabst, A., and Vaux, G., Min. Mag., 1939, vol. 25, p. 264.CrossRefGoogle Scholar

page 679 note 2 Chao, S. H. and Taylor, W. H., Proc. Roy. Soc. London, Ser. A, 1940, vol. 176, p. 76. [M.A. 8–13.]CrossRefGoogle Scholar

page 679 note 3 SirBragg, Lawrence and Lipson, H., Journ. Sci. Instruments, 1943, vol. 20, p. 110 (see particularly figs. 5a and 5b, p. 112).CrossRefGoogle Scholar

page 679 note 4 Daniel, Vera and Lipson, H., Proc. Roy. Soc. London, Ser. A, 1944, vol. 181, p. 378.CrossRefGoogle Scholar