KHCO3 Allan D R, Marshall W G, Pulham C R American Mineralogist 92 (2007) 1018-1025 The high-pressure crystal structure of potassium hydrogen carbonate (KHCO3) Sample: P = 5.38 GPa _database_code_amcsd 0004375 6.1393 5.2958 4.2228 95.297 100.665 108.892 P-1 atom x y z K .300 .130 .288 D .0887 .7071 .541 C .2272 .572 .911 O1 .2063 .773 .747 O2 .1097 .333 .776 O3 .3757 .643 .179