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On Cornetite from Bwana Mkubwa, Northern Rhodesia

Published online by Cambridge University Press:  14 March 2018

A. Hutchinson  and
A. M. MacGregor
A. Hutchinson
Affiliation:
University of Cambridge
A. M. MacGregor
Affiliation:
University of Cambridge
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Extract

The mineral to be described in the following pages was found hy Mr. J. L. Popham in 1910 at Bwana Mkubwa, Northern Rhodesia, and was sent by him to Mr. A. E. V. Zealley, at that time Curator of the Rhodesia Museum, Bulawayo. Investigations conducted by one of us (A. M. M.) in Bulawayo showed that the mineral occurred as definite, though minute, orthorhombic crystals and that it consisted in the main of copper and phosphoric acid, but that it differed in many respects from the known hydrated copper phosphates such as libethenite, tngilitc, dihydrite, or pseudomalachite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 19 , Issue 95 , December 1921 , pp. 225 - 232
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1921

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References

page 236 note 1 Nature, 1918, vol. 92, p. 364 Google Scholar.

page 236 note 2 Cesàro, G., Sur un nouveau mineral du Katanga. Ann. See. geol. Belgique, 1912, vol. 39, Bull. p. 241 Google Scholar, and Annexo to vol. 89 (Publ. relatives au Congo Belge), p. 41.

page 236 note 3 H. Buttgenbach, Les Mindraux et lea Roches, Liego, 1917, p. 452.

page 227 note 1 Bwana Mkubwa is situated in latitude 13° 2' S. and longitude 28° 45' E. Tile mine ‘L'Étoile du Congo’ lies a few miles north-east of Élisabethville, the capital of the province of Katanga, Belgian Congo. The deposits at these two localities, which are more than 100 miles apart, probably belong to the same formation and have been compared by F. E. Studt, Geology of Katanga and Rhodesia, N., Trans. Geol. Soc. S. Africa, 1914, vol. 16, p. 68 Google Scholar.

page 229 note 1 Cesàro gives 5·5, but our specimen failed to scratch apatit.