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Sperrylite crystals from the Transvaal

Published online by Cambridge University Press:  14 March 2018

L. J. Spencer
L. J. Spencer*
Affiliation:
Mineral Department, British Museum (Natural History)
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Extract

A very fine and unusual crystal of sperrylite, recently presented by Mr. G. H. Beatty of Johannesburg to the mineral collection of the British Museum, came from a new adit on the Tweefontein farm (no. 1083), about 10 miles NNW. of Potgietersrust, Waterberg district, Transvaal. It had been found embedded in copper-stained limonite in crush-zones of banded ironstone underlying norite. The limonite matrix is presumably an alteration-product of sulphides (pyrrhotine, pentlandite, and chalcopyrite). The banded ironstone is an altered sediment belonging to the dolomite series, and is penetrated by apophyses from the basic margin of the Bushveld igneous complex.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 114 , September 1926 , pp. 94 - 97
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1926

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References

page 96 note 1 Journ. Chem. Metall. Mining Soo. South Africa, 1926, vol. 26, p. 183.

page 96 note 2 Report of meeting in South African Journ. Mining & Engin., 1926, vol. 87, p. 124, and Mining Mag. London, 1926, vol. 34, p. 379 ; to appear also in Proc. Geol. Soc. South Africa for 1926.

page 96 note 3 P. A. Wagnor, On magmatic nickel deposits of the Bushveld complex in tho Rustenburg district, Transvaal. Mem. Geol. Survey, South Africa, 1924, no. 21, p. 100 [Min. Abstr., vol. 3, p. 44 ]. Also mentioned in Trans. Geol. Soc. South Africa, 1926, vol. 28 (for 1925), p. 98 [Min. Abstr., vol. 3, p. 75 ].

page 96 note 4 Wagner, P. A., Trans. Geol. Soc. South Africa, 1926, vol. 28 (for 1925), p. 117 Google Scholar.

page 96 note 5 Mentioned by Wagner, P. A., South African Journ. Mining & Engin., 1926, vol. 37, p. 124 Google Scholar; Mining Mag. London, 1926, vol. 34, p. 380.