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 = 794 C _database_code_amcsd 0009108 5.3333 8.9417 6.7339 90 90 90 Pmcn atom x y z Uiso Ba .25 .4162 .7550 .0390 C .25 .7442 -.0569 .0978 O1 .25 .8915 -.0750 .0978 O2 .4618 .6836 -.0737 .0978