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 = 310 deg C, P = 19.78 GPa
rocksalt structure
_database_code_amcsd 0007675
4.1194 4.1194 4.1194 90 90 90 Fm3m
atom  x  y  z occ
Mg    0  0  0  .6
Fe    0  0  0  .4
O    .5 .5 .5