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, mounted on a cryo-tip with Be shroud
_database_code_amcsd 0000510
4.208 4.208 4.208 90 90 90 Fm3m
atom  x  y  z Biso
Mg    0  0  0  .25
O    .5 .5 .5  .26