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 language | English |
|---|---|
| Pages (from-to) | 22-33 |
| Number of pages | 12 |
| Journal | Contributions to Mineralogy and Petrology |
| Volume | 35 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 1972 |
| Externally published | Yes |