Periclase Boiocchi M, Caucia F, Merli M, Prella D, Ungaretti L European Journal of Mineralogy 13 (2001) 871-881 Crystal-chemical reasons for the immiscibility of periclase and wustite under lithospheric P,T conditions Sample: Per.synt _database_code_amcsd 0006901 4.2113 4.2113 4.2113 90 90 90 Fm-3m atom x y z Biso Mg 0 0 0 .35 O .5 .5 .5 .36