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An accurate determination of the cell dimensions of bultfonteinite, Ca4Si2O10H6F2

Published online by Cambridge University Press:  14 March 2018

Helen D. Megaw  and
C. H. Kelsey
Helen D. Megaw
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
C. H. Kelsey
Affiliation:
Crystallographic Laboratory, Cavendish Laboratory, University of Cambridge
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Extract

Bultfonteinite from Bultfontein mine, Kimberley, South Africa, is a hydrated fluorine-containing calcium silicate, of approximate composition Ca4Si2O10H6F2. It was first described in 1932 by Parry, Williams, and Wright,1 who gave an account of its morphology, optical properties, composition, and chemical relationships. It is triclinic but markedly pseudo-orthorhombic. The present work consists primarily of a determination of the unit-cell dimensions, involving a more accurate evaluation of the interaxial angles than the earlier one; this is followed by some tentative suggestions about the structure.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 228 , March 1955 , pp. 569 - 573
Copyright
Copyright © 1955, The Mineralogical Society

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References

page 569 note 1 Parry, J., Williams, A.F., and Wright, F.E., Min. Mag., 1932, vol. 23, p. 145 CrossRefGoogle Scholar.

page 570 note 1 M, M.C.. Farquhar and Lipson, H., Proc. Physical Soe., 1945, “col 58, p. 200.Google Scholar

page 570 note 2 Weisz, O., Cochran, W., and Cole, W.F., Acta Cryst., 1948, vol. 1 CrossRefGoogle Scholar, No. 83. [M.A. 10-330.]

page 573 note 1 Megaw, H.D., Acta Cryst., 1952, vol. 5, p. 477.CrossRefGoogle Scholar [M.A. 1298.]