☆ 4.8 Letter

Reply to Nemeth and Garvie: Evidence for lonsdaleite in ureilite meteorites

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2023)

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Article Physics, Applied

Hardness of nano- and microcrystalline lonsdaleite

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Summary: In this study, the hardness of two different forms of lonsdaleite was measured using nanoindentation. The results indicate that the hardness of lonsdaleite is similar to that of diamond, suggesting that polycrystalline lonsdaleite is not significantly harder than similar forms of diamond.

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Questionable lonsdaleite identification in ureilite meteorites

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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2023)

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Sequential Lonsdaleite to Diamond Formation in Ureilite Meteorites via In Situ Chemical Fluid/Vapor Deposition

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Summary: Ureilite meteorites, which may be the only samples from a dwarf planet's mantle, contain abundant diamonds. Electron microscopy reveals the distribution of lonsdaleite, diamond, and graphite in ureilites, suggesting a formation process involving pseudomorphic replacement of graphite by lonsdaleite, followed by diamond and graphite formation. This process could be used to manufacture shaped lonsdaleite at high pressure and also provides a model that reconciles conflicting observations about diamond formation in ureilites.

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