Occurrence
Lonsdaleite occurs as microscopic crystals associated with diamond in several meteorites: Canyon Diablo, Kenna, and Allan Hills 77283. It has also been reported from the Tunguska impact site. It is also naturally occurring in non-bolide diamond placer deposits in the Sakha Republic. It has also been found in sediments dated to 12,900 years ago, at Lake Cutizeo, in the state of Guanajuato, Mexico, supportive of the controversial Younger Dryas impact hypothesis.
Read more about this topic: Lonsdaleite
Famous quotes containing the word occurrence:
“One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.”
—Oscar Wilde (1854–1900)