A new type of meteoritic diamond in the enstatite chondrite Abee

Computer Science

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Chondrites, Enstatite, Meteoritic Composition, Meteoritic Diamonds, Carbon Isotopes, Cosmochemistry, Nitrogen Isotopes, Xenon Isotopes

Scientific paper

Diamonds with delta-C-13 values of -2 ppm and less than 50 parts per million (by mass) nitrogen have been isolated from the Abee enstatite chondrite by the same procedure used for concentrating C-delta, the putative interstellar diamond found ubiquitously in primitive meteorites and characterized by delta-C-13 values of -32 to -38 ppm, nitrogen concentrations of 2000 to 12,500 parts per million, and delta-N-15 values of -340 ppm. Because the Abee diamonds have typical solar system isotopic compositions for carbon, nitrogen, and xenon, they are presumably nebular in origin rather than presolar. Their discovery in an unshocked meteorite eliminates the possibility of origins normally invoked to account for diamonds in ureilites and iron meteorites and suggests a low-pressure synthesis. The diamond crystals are about 100 nanometers in size, and of an unusual lath shape, and represent about 100 parts per million of Abee by mass.

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