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 = 708 C _database_code_amcsd 0009106 5.3337 8.9361 6.6949 90 90 90 Pmcn atom x y z Uiso Ba .25 .4161 .7550 .0348 C .25 .7489 -.0649 .0837 O1 .25 .8986 -.0720 .0837 O2 .4612 .6818 -.0776 .0837