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 = 25 C _database_code_amcsd 0009098 5.3103 8.9122 6.4365 90 90 90 Pmcn atom x y z Uiso Ba .25 .4162 .7556 .0042 C .25 .7434 -.0711 .0242 O1 .25 .9011 -.0775 .0242 O2 .4654 .6805 -.0788 .0242