Aragonite 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 = 197 C Note: P = 101 kPa _database_code_amcsd 0017834 4.9635 8.0024 5.7760 90 90 90 Pmcn atom x y z Uiso Ca .25 .4137 .7538 .013 C .25 .7647 -.0660 .033 O1 .25 .9184 -.0876 .033 O2 .4734 .6844 -.0982 .033