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 = 915 C, P = 1 atm _database_code_amcsd 0000508 4.257 4.257 4.257 90 90 90 Fm3m atom x y z Mg 0 0 0 O .5 .5 .5