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 = 1042 C, P = 1 atm
_database_code_amcsd 0000509
4.264 4.264 4.264 90 90 90 Fm3m
atom  x  y  z
Mg    0  0  0
O    .5 .5 .5