Reports

Hexagonal Diamonds in Meteorites: Implications

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Science  24 Feb 1967:
Vol. 155, Issue 3765, pp. 995-997
DOI: 10.1126/science.155.3765.995

Abstract

A new polymorph of carbon, hexagonal diamond, has been discovered in the Canyon Diablo and Goalpara meteorites. This phase had been synthesized recently under specific high-pressure conditions in the laboratory. Our results: provide strong evidence that diamonds found in these meteorites were produced by intense shock pressures acting on crystalline graphite inclusions present within the meteorite before impact, rather than by disintegration of larger, statically grown diamonds, as some theories propose.