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An inclusion of magnetite in diamond

Published online by Cambridge University Press:  14 March 2018

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

A Minute, black fragment of material, taken by Dr. J. R. Sutton from a cavity exposed on a cleavage-surface of a colourless diamond from Bultfontein mine, Kimberley, South Africa, was sent by him for determination. It is black with a sub-metallic lustre and in parts a bronzed tarnish; and is quite opaque even on the edges. The form is roughly that of a triangular chip, measuring 11/2 by 11/4 mm. with a greatest thickness of about 1/2 mm. The weight is about 1 milligram. Tile surface shows a small and uneven to granular fracture. On one portion there is a good crystal-face which reflects a sharp image ; and on one part of this face there is a stepped growth with striae at 60°.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 20 , Issue 107 , December 1924 , pp. 245 - 247
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1924

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References

Page 246 note 1 Sutton, J. R., Inclusions in diamond frona South Africa. Min. Mag., 1921, vol. 19, pp. 208–210 CrossRefGoogle Scholar.

Page 246 note 2 Cohen, E., Über Einschlüsse in südafrikanisehen Diamanten. Neues Jahrbueh Min., 1876, pp. 752–758 Google Scholar.

Page 246 note 3 Friedel, C., Bull. Soc. China. Paris, 1884, vol. 41, p. 104 Google Scholar.

Page 246 note 4 Friedel, G., Sur les inclusions noires contenues dans les diamants du Cap. Compt. Rend. Acad. Sci. Paris, 1923, vol. 177, pp. 1085–1087 Google Scholar. [Min. Abstr., vol. 2, p. 234.]