Calcite Antao S M, Hassan I The Canadian Mineralogist 48 (2010) 1225-1236 Temperature dependence of the structural parameters in the transformation of aragonite to calcite, as determined from in situ synchrotron powder X-ray-diffraction data Locality: Cuenca, Spain Note: T = 702 C Note: P = 101 kPa _database_code_amcsd 0017869 4.9742 4.9742 17.4676 90 90 120 R-3c atom x y z Uiso Ca 0 0 0 .0420 C 0 0 .25 .077 O1 .2490 0 .25 .077