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 = 297 C Note: P = 101 kPa _database_code_amcsd 0017839 4.9683 8.0196 5.7989 90 90 90 Pmcn atom x y z Uiso Ca .25 .4133 .7550 .016 C .25 .7633 -.0634 .036 O1 .25 .9198 -.0860 .036 O2 .4721 .6856 -.0981 .036