The full study - Tomkins et al: Sequential lonsdaleite to diamond formation in ureilite meteorites via in situ chemical fluid/vapour deposition - is published in PNAS, DOI: 10.1073/pnas.2208814119.. Lonsdaleite's nickname derives from its crystalline structure: Whereas the carbon atoms in diamond are arranged in a cubic lattice, lonsdaleite's carbon atoms are locked in a hexagonal.
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At this writing, one can do internet searches for "lonsdaleite diamond" or "lonsdaleite hexagonal diamond" and find alumina mill balls being sold for prices ranging from $20 to $195,000 apiece. OK, the high priced one was actually advertised as a "Lonsdaleite Meterorite [sic] Diamond" and it was rather large at 2.5 inches in diameter.. Researchers have come up with models for the structure of lonsdaleite before, and they theorized the hexagonal structure could make it up to 58 per cent harder than regular diamonds, Salek said.
