Calcite Paquette J, Reeder R J American Mineralogist 75 (1990) 1151-1158 Single-crystal X-ray structure refinements of two biogenic magnesian calcite crystals sample LB _database_code_amcsd 0001328 4.9382 4.9382 16.832 90 90 120 R-32/c atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Ca 0 0 0 .871 .0190 .0190 .00131 .0095 0 0 Mg 0 0 0 .129 .0190 .0190 .00131 .0095 0 0 C 0 0 .25 .0171 .0171 .00147 .00855 0 0 O .2587 0 .25 .0223 .044 .00259 .022 -.0009 -.0018