Black material on mineral inclusions and in internal fracture planes in diamond |
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Authors: | J. W. Harris |
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Affiliation: | (1) Department of Chemical Crystallography, University College, W.C.1 London, England |
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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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