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.4041 _database_code_amcsd 0006902 4.2154 4.2154 4.2154 90 90 90 Fm-3m atom x y z occ Biso Mg 0 0 0 .974 .35 Fe 0 0 0 .026 .35 O .5 .5 .5 .36