Diamonds everywhere
Article Abstract:
Different forms of diamonds found in nature are formed by various condensation, shock metamorphism, irradiation and vapor phase processes. Polycrystalline diamonds of 1 cm size, containing crustal chemical and isotopic characteristics have been found in Russian and Ukrainian meteorite impact sites. The conformation of nanodiamonds reveal their formation by condensation processes. Polycrystalline black diamonds or carbonado diamonds are hard polycrystalline aggregates having a porous matrix of irregular crystallites and their formation process is unknown.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Rich pickings for astronomers
Article Abstract:
The dust clouds around four protostars or nascent stars contain diamonds. L.J. Allamandola and colleagues concluded that the dust clouds' spectra are best explained by invoking the presence of material at least strongly resembling diamonds but with an outer layer of hydrogen. This discovery supports the earlier detection of diamonds in meteorites that were not subjected to shock-transformation on impact. Determining how either the interstellar or the meteoritic diamonds formed requires further research.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Meteoritic oxide grain from supernova found
Article Abstract:
Mineral grains formed in stellar explosions or around stars are contained within meteorites. A new oxide grain, named T84, rich in the isotope oxygen-16, has been found in an acid-resistant residue of the Tieschitz meteorite. T84's composition suggests that its source is ejecta of a type II supernova. The grain's discovery shows that the early Solar System contained oxide grains from supernovae.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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