CO2 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, quartz structure _database_code_amcsd 0018751 4.011 4.011 4.214 90 90 120 *P3_221 0 0 .66666666666667 atom x y z C .448 0 0 O .404 .306 .081