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Note on the colours of some alluvial Diamonds
Published online by Cambridge University Press: 14 March 2018
Extract
In 1906 the present writer gave a brief account of the interesting alluvial diamond field which is situated on the borders of the Somabula Forest in Southern Rhodesia. The area is not of very great economic importance, but it has nevertheless yielded to date about 10,500 carats of diamonds (valued at over £45,000). These are extracted from thick beds of gravel which, as described in the paper referred to, generally consist of well-rounded pebbles in a matrix of sandy clay.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 17 , Issue 81 , September 1915 , pp. 202 - 204
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1915
References
page 202 note 1 Mennell, F. P., Geol. Mag., 1906, pp. 459–462 CrossRefGoogle Scholar.
page 202 note 2 The colours when cut are those known as 'blue-white', 'Cape-white ', &c.
page 203 note 1 All the diamonds extracted during several years' work on the field were seen by the writer.
page 204 note 1 Seep for instance, Hatch, F. H., Proc. Cambridge Phil. Soc, 1913, vol. xvii, p. 68 Google Scholar.
page 204 note 2 Sir Crookes, W., Proc. Roy. Soc., London, 1904, vol. lxxiv, p. 47 CrossRefGoogle Scholar.
page 204 note 3 Sir Crookes, W., Phil. Trans. Roy. Soc., 1914, ser. A, vol. ccxiv, p. 436 Google Scholar.
page 204 note 4 It is, of course, assumed that they were originally derived from ultrabasic rocks, as in all cases where they have been found in situ.