Lonsdaleite Bundy F P, Kasper J S Journal of Chemical Physics 46 (1967) 3437-3446 Hexagonal diamond-a new form of carbon _database_code_amcsd 0012989 2.52 2.52 4.12 90 90 120 P6_3/mmc atom x y z C 1/3 2/3 .0625