Calcite Sitepu H, O'Connor B H, Li D Journal of Applied Crystallography 38 (2005) 158-167 Comparative evaluation of the March and generalized spherical harmonic preferred orientation models using X-ray diffraction data for molybdite and calcite powders Note: March model Locality: synthetic _database_code_amcsd 0012867 4.991 4.991 17.068 90 90 120 R-3c atom x y z Uiso Ca 0 0 0 .01550 C 0 0 .25 .01771 O .245 0 .25 .01771