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 = 777 C _database_code_amcsd 0009107 5.3338 8.9403 6.7252 90 90 90 Pmcn atom x y z Uiso Ba .25 .4161 .7550 .0378 C .25 .7464 -.0591 .0885 O1 .25 .8965 -.0737 .0885 O2 .4622 .6821 -.0759 .0885