At temperatures above about 1100° C degassed molten kimberlites were found to attack diamond, producing both graphite and metallic iron on the diamond surface. Using ordinary kimberlites in experiments performed at 1 Kb in a closed system, diamonds developed etch features (at temperatures above about 1000° C), consistent with attack by wet CO2, but no graphite or iron was formed on the surfaces of the diamonds.
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Harris, J.W., Vance, E.R. Studies of the reaction between diamond and heated kimberlite. Contrib. Mineral. and Petrol. 47, 237–244 (1974). https://doi.org/10.1007/BF00390148
- Mineral Resource
- Closed System
- Metallic Iron