MgSiO3 Murakami M, Hirose K, Kawamura K, Sata N, Ohishi Y Science 304 (2004) 855-858 Post-perovskite phase transition in MgSiO3 Sample: P = 121 GPa, T = 300 K Note: CaIrO3-type structure from ab initio calculations using observed cell parameters _database_code_amcsd 0015437 2.456 8.042 6.093 90 90 90 Cmcm atom x y z Mg 0 .253 .25 Si 0 0 0 O1 0 .923 .25 O2 0 .631 .436