"' Lonsdaleite "'( named in honour of Kathleen Lonsdale ), also called "'hexagonal diamond "'in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice.
22.
This article may interest you, as it pertains to some very rare substances ( including lonsdaleite ) w / similar structures as diamond, but may be much harder due to various reasons . [ Talk ] 14 : 53, 7 July 2011 ( UTC)
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If that means what I think it means, then the liquid carbon would not adjoin on it directly, so it would be better described as liquid diamond; even if it did, it would still be " diamond " in the loose sense that lonsdaleite is " cubic diamond " . talk ) 12 : 10, 27 June 2013 ( UTC)
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Researchers have criticized the conclusions of various studies for incorrect age-dating of the sediments, contamination by modern carbon, and inconsistent hypothesis that made it difficult to predict the type and size of bolide, lack of proper identification of lonsdaleite, confusing an extraterrestrial impact with other causes such as fire, and for inconsistent use of the carbon spherule " proxy ".
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This illustration depicts eight of the allotropes ( different molecular configurations ) that pure carbon can take ( top to bottom, left to right ) : a ) Diamond, b ) Graphite, c ) Lonsdaleite, d ) Buckminsterfullerene ( C 60 ), e ) C 540, f ) C 70, g ) Amorphous carbon, h ) single-walled carbon nanotube.
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Recent research has been reported that at Lake Cuitzeo in the central Mexican state of Guanajuato evidence supporting a modified version of the Younger Dryas impact hypothesi---involving a much smaller, non-cometary impactor was found in lake bed cores dating to 12, 900 BP . The reported evidence included nanodiamonds ( including the hexagonal form called lonsdaleite ), carbon spherules, and magnetic spherules.
