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

J. W. Harris*

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)22-33
Number of pages12
JournalContributions to Mineralogy and Petrology
Volume35
Issue number1
DOIs
Publication statusPublished - Mar 1972
Externally publishedYes

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