Quartz 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 0018749 4.929 4.929 5.319 90 90 120 *P3_221 0 0 .66666666666667 atom x y z Si .464 0 0 O .414 .276 .109