Pertoldite Gibbs G V, Boisen M B, Downs R T, Lasaga A C Materials Research Society Symposia Proceedings 121 (1988) 155-165 Mathematical Modeling of the structures and bulk moduli of TX2 quartz and cristobalite structure types, T = C, Si, Ge and X = O, S Locality: theoretical _database_code_amcsd 0018750 5.114 5.114 5.426 90 90 120 *P3_221 0 0 .66666666666667 atom x y z Ge .450 0 0 O .406 .300 .086