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Black material on mineral inclusions and in internal fracture planes in diamond

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Abstract

The black material observed on the surface of crystalline inclusions in diamond and also in adjacent internal fracture planes has been classified as a result of a preliminary examination of several hundred diamonds from Sierra Leone, Ghana, and South Africa (particularly the Premier Mine), as well as diamond slices of unknown origin, followed by a detailed examination of some 100 diamonds. X-ray, electron diffraction, and qualitative electron microprobe techniques were used in identifying this material as graphite, pyrrhotite and pentlandite. The possible origins of these minerals are discussed.

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  1. Department of Chemical Crystallography, University College, W.C.1, London, England

    J. W. Harris

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  1. J. W. Harris
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Harris, J.W. Black material on mineral inclusions and in internal fracture planes in diamond. Contr. Mineral. and Petrol. 35, 22–33 (1972). https://doi.org/10.1007/BF00397374

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  • DOI: https://doi.org/10.1007/BF00397374

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