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Manganese-iron garnet from Otjosondu, South-West Africa1

Published online by Cambridge University Press:  14 March 2018

F. H. S. Vermaas
F. H. S. Vermaas*
Affiliation:
Geological Survey, Pretoria, South Africa
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Extract

Garnets rich in manganese and iron, associated with bariumfelspars, have been reported by de Villiers from the manganese ores of Otjosondu, South-West Africa, in which they occur as the most abundant silicate mineral. The farm Otjosondu is 80 miles NE. of Okahandja, a railway station on the line between Windhoek and Walvis.

One specimen (referred to as no. 1), of which de Villiers published a chemical analysis, is massive and of a somewhat dark-yellowish colour. The material is traversed by veinlets of hyalophane (Cn9), about 0.5 mm. broad.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 218 , September 1952 , pp. 946 - 951
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1952

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Footnotes

1

Published by permission of the Honourable, the Minister of Mines of the Union of South Africa.

References

page 946 note 2 de Villiers, J. E., The manganese ores of Otjosondu, South–West Africa. Trans. Geol. Soc. South Africa, 1951, vol. 54, pp. 89–98 Google Scholar. [M.A. 11–553.]

page 946 note 3 Straumanis, M. E., Journ. Appl. Physics, 1949, vol. 20, p. 726 CrossRefGoogle Scholar.

page 947 note 1 Wasserstein, B., Precision lattice measurements of galena. Amer. Min., 1951, vol. 36, pp. 102–115 Google Scholar. [M.A. 11–316.]

page 949 note 1 Fairbairn, W. H., Packing in ionic minerals. Bull. Geol. Soc. Amer., 1943 vol. 54, p. 1035 CrossRefGoogle Scholar. [M.A. 9–41.]

page 949 note 2 Fermor, L. L., Mem. Geol. Surv. India, 1909, vol. 37, p. 182 Google Scholar; Rec. Geol. Surv. India, 1926, vol. 59, p. 204. [Min. Mag. 21–558; M.A. 3–308.]

page 949 note 3 Piddington, H., Journ. Asiatic Soc. Bengal, 1851, vol. 19 (for 1850), p. 145 Google Scholar.

page 949 note 4 F. R. Mallet, Geology of India, pt. 4, mineralogy, 1887, p. 90.

page 949 note 5 J. D. Dana, System of mineralogy. 5th edit., 1868, p. 443.

page 950 note 1 W. L,. Bragg, Atomic structure of minerals. Cornell Univ., 1937. [M.A. 7–7.J