Abstract
Primitive meteorites contain up to 400 p.p.m. of a very fine-grained type of carbon, noncommittally called Cδ1. It apparently conies from outside the Solar System, as it carries isotopically anomalous krypton and xenon ('Xe–HL' or 'CCFXe', enriched twofold in the lightest and heaviest isotopes2) and nitrogen (δ15N =–330‰3; that is, depleted in 15N by –330‰ relative to atmospheric nitrogen), although the carbon itself is within the terrestrial range (δ13C =–38‰1). Expanding on a preliminary report4, we now present evidence that part or all of Cδ is diamond—not shock-produced but primary, formed by stellar condensation as a metastable phase. It appears that interstellar dust contains diamond.
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Lewis, R., Ming, T., Wacker, J. et al. Interstellar diamonds in meteorites. Nature 326, 160–162 (1987). https://doi.org/10.1038/326160a0
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DOI: https://doi.org/10.1038/326160a0
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