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 = 218 C Note: P = 101 kPa _database_code_amcsd 0017835 4.9644 8.0057 5.7805 90 90 90 Pmcn atom x y z Uiso Ca .25 .4136 .7539 .013 C .25 .7643 -.0660 .034 O1 .25 .9184 -.0875 .034 O2 .4732 .6845 -.0982 .034