Periclase Fei Y, Mao H K, Shu J F, Hu J Physics and Chemistry of Minerals 18 (1992) 416-422 P-V-T equation of state of magnesiowustite (Mg0.6Fe0.4)O Sample: T = 676 deg C, P = 16.66 GPa rocksalt structure _database_code_amcsd 0007656 4.1500 4.1500 4.1500 90 90 90 Fm3m atom x y z occ Mg 0 0 0 .6 Fe 0 0 0 .4 O .5 .5 .5