A new natural, super-hard, transparent polymorph of carbon from the Popigai impact crater, Russia

Ahmed El Goresy; Leonid S. Dubrovinsky; Philippe Gillet; Smail Mostefaoui; Günther Graup; Michael Drakopoulos; Alexandre S. Simionovici; Varghese Swamy; Victor L. Masaitis

Comptes Rendus. Géoscience, Volume 335 (2003) p. 889-898