Moissanite Xu Y N, Ching W Y Physical Review B48 (1993) 4335-4351 Electronic, optical, and structural properties of some wurtzite crystals _database_code_amcsd 0015175 3.076 3.076 5.048 90 90 120 P6_3mc atom x y z Si 2/3 1/3 0 C 2/3 1/3 .375