Sequential Lonsdaleite to Diamond Formation in Ureilite Meteorites via In Situ Chemical Fluid/Vapor Deposition
Sign Up to like & getrecommendations! Published in 2022 at "Proceedings of the National Academy of Sciences of the United States of America"
DOI: 10.1073/pnas.2208814119
Abstract: Significance We report on lonsdaleite and diamond formation in ureilite meteorites, which likely come from the mantle of a destroyed inner solar system dwarf planet. In these meteorites, folded graphite crystals have been pseudomorphed by… read more here.
Keywords: formation ureilite; diamond formation; lonsdaleite diamond; vapor deposition ... See more keywords
Diamond formation kinetics in shock-compressed C─H─O samples recorded by small-angle x-ray scattering and x-ray diffraction.
Sign Up to like & getrecommendations! Published in 2022 at "Science advances"
DOI: 10.1126/sciadv.abo0617
Abstract: Extreme conditions inside ice giants such as Uranus and Neptune can result in peculiar chemistry and structural transitions, e.g., the precipitation of diamonds or superionic water, as so far experimentally observed only for pure C─H… read more here.
Keywords: ray diffraction; ray; diamond formation; small angle ... See more keywords
Type IIa Diamond Formation
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DOI: 10.1134/s1028334x18100197
Abstract: The petrological model of type IIa diamond formation is proposed. By the model these diamonds were formed from fluids on the last stages of kimberlite magma formation at 600–700°C and in the range of 20–30… read more here.
Keywords: type iia; iia diamond; diamond formation; formation ... See more keywords