Witherite Antao S M, Hassan I Physics and Chemistry of Minerals 34 (2007) 573-580 BaCO3: high-temperature crystal structures and the Pmcn --> R3m phase transition at 811 C Locality: synthetic Sample: T = 606 C _database_code_amcsd 0009104 5.3322 8.9310 6.6537 90 90 90 Pmcn atom x y z Uiso Ba .25 .4161 .7556 .0309 C .25 .7522 -.0668 .0758 O1 .25 .8998 -.0712 .0758 O2 .4611 .6815 -.0791 .0758