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Spectrographic and X-ray data on some fluorites from the Transvaal, South Africa

Published online by Cambridge University Press:  14 March 2018

J. G. D. Steyn
J. G. D. Steyn*
Affiliation:
Geological Survey, PretoriaSouth Africa1
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Extract

The fluorites of the Transvaal occur in different rock-types, viz in the dolomite of the Transvaal System, in acidic rocks (red granite and granophyre of the Bushveld igneous complex and Rooiberg felsites), and in alkalic rocks. The purpose of this study was to determine:

  1. (1) What minor elements are present in selected fluorites.

  2. (2) What the effect of these elements is on the respective cube-edges.

  3. (3) Whether these elements have any geological significance.

Fluorite displays a wide range of colour; both colourless and distinctly coloured specimens were examined. Differently coloured varieties could in some instances be taken from the same sample. The choice of coloured varieties in the different rock-types was nevertheless limited. Only light-coloured fluorites occur in the dolomite, whereas the alkalic rocks yielded only very dark purple specimens.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 224 , March 1954 , pp. 327 - 332
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1954

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References

Page 327 Note 2 Kent, L. E., Russell, H. D., and van Rooyen, D. P., Fluorspar in the Union of South Africa and South West Africa. Bull. Geol. Surv. S. Africa, 1943, no. 14.Google Scholar [M.A. 9-28.]

Page 329 Note 1 Bradley, A. J. and Jay, A. H., Proc. Physical Soc. London, 1932, vol. 14, p. 563.CrossRefGoogle Scholar [M.A. 5-305.]

Page 329 Note 2 Wasserstein, B., Amer. Min., 1951, vol. 37, p. 102.Google Scholar [M.A. 11-316.]

Page 331 Note 1 Rankama, K. and Sahama, T. G., Geochemistry. Chicago, 1950, p. 122.Google Scholar [M.A. 11-409.]