Abstract
MARX1 proposed that natural diamonds were formed by a reduction of CO2 and other theories have been proposed to explain their formation2–6. Carbon dioxide is a common constituent7,8 and has been found as a gas in natural diamonds9. Marx proposed that pyrrhotite is active in the reduction process because it has been found as an inclusion in diamonds10. Furthermore, thermodynamic calculations showed such a reduction reaction to be energetically possible:
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LANGFORD, R., MELTON, C. & GIARDINI, A. Diamond growth by sulphide reduction of CO2. Nature 249, 647 (1974). https://doi.org/10.1038/249647a0
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DOI: https://doi.org/10.1038/249647a0
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