Periclase
Hazen R M
American Mineralogist 61 (1976) 266-271
Effects of temperature and pressure on the cell dimension and X-ray temperature
factors of periclase
T = 23 C, P = 1 atm, in a high-pressure cell with absorption curve #1
_database_code_amcsd 0000512
4.212 4.212 4.212 90 90 90 Fm3m
atom  x  y  z Biso
Mg    0  0  0  .43
O    .5 .5 .5  .56