Carbonado (diamond)

The origin of carbonado is controversial, but several hypotheses have been proposed:
#Direct conversion of organic Carbon under high-pressure conditions (the Earth's interior)
#Shock Metamorphism induced by Meteor itic impact at the Earth 's surface
#Radiation-induced Diamond formation by spontaneous fission of Uranium and Thorium
These hypotheses, however, still have several problems. First, if carbonado were formed by phase transformation of organic Graphite inside the Earth, carbonado would be found all over the world. But carbonado appears only in the Central African Republic and Brazil . Second, the formation process of a shock metamorphic event also has problems, because shock-induced natural polycrystalline diamonds usually have hexagonal diamond ( Lonsdaleite ) inside the samples and the presence of hexagonal diamond inside carbonado has not been reported. The third hypothesis, radiation-induced diamond formation, is questionable as well, because the energy of radiogenic fission is too small to create polycrystalline diamond of the large grain size of carbonado (up to 500 Micrometers ). These diamonds are currently being used in various designs and settings in the jewelry industry.

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Carbonado (diamond)