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 = 275 C Note: P = 101 kPa _database_code_amcsd 0017838 4.9672 8.0157 5.7938 90 90 90 Pmcn atom x y z Uiso Ca .25 .4134 .7547 .015 C .25 .7631 -.0641 .036 O1 .25 .9193 -.0865 .036 O2 .4726 .6853 -.0981 .036