Tausonite Mitchell R H, Chakhmouradian A R, Woodward P M Physics and Chemistry of Minerals 27 (2000) 583-589 Crystal chemistry of perovskite-type compounds in the tausonite-loparite series, (Sr1-2xNaxLax)TiO3 Sample: x = 0.25 _database_code_amcsd 0008451 5.5016 5.5016 7.7976 90 90 90 I4/mcm atom x y z occ Biso SrA 0 .5 .25 .5 .93 NaA 0 .5 .25 .25 .93 LaA 0 .5 .25 .25 .93 Ti 0 0 0 .84 O1 0 0 .25 2.2 O2 .233 .733 0 .6