Periclase
Sasaki S, Fujino K, Takeuchi Y
Proceedings of the Japan Academy 55 (1979) 43-48
X-Ray determination of electron-density distributions in oxides, MgO,
MnO, CoO, and NiO, and atomic scattering factors of their
constituent atoms
_cod_database_code 1000053
_database_code_amcsd 0015329
4.217 4.217 4.217 90 90 90 Fm3m
atom  x  y  z
Mg    0  0  0
O    .5 .5 .5