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Cliftonite in Meteorites: A Proposed Origin

Robin Brett and G. T. Higgins
Science
New Series, Vol. 156, No. 3776 (May 12, 1967), pp. 819-820
Stable URL: http://www.jstor.org/stable/1722017
Page Count: 2
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Abstract

Cliftonite, a polycrystalline aggregate of graphite with cubic morphology, is known in ten meteorites. Some workers have considered it to be a pseudomorph after diamond, and have used the proposed diamond ancestry as evidence of a meteoritic parent body of at least lunar dimensions. We have synthesized cliftonite in Fe-Ni-C alloys in vacuum, as a product of decomposition of cohenite [(Fe,Ni)$_{3}$C]. We therefore suggest that a high pressure origin is unnecessary for meteorites which contain cliftonite, and that these meteorites were formed at low pressures. This conclusion is in agreement with other recent evidence.

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