Bridgmanite Kojitani H, Katsura T, Akaogi M Physics and Chemistry of Minerals 34 (2007) 257-267 Aluminum substitution mechanisms in perovskite-type MgSiO3: an investigation by Rietveld analysis Sample: Nonstoichiometric with xAl = 0.10 Locality: synthetic _database_code_amcsd 0009079 4.7769 4.9336 6.9085 90 90 90 Pbnm atom x y z occ Biso Mg .9886 .0561 .25 .97 .30 Al .9886 .0561 .25 .03 .30 Si 0 .5 0 .93 .15 Al 0 .5 0 .07 .15 O1 .1058 .4628 .25 .993 .82 O2 .6983 .2967 .0533 .993 .65