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 = 4.77 GPa _database_code_amcsd 0004374 6.1858 5.3147 4.2330 95.253 100.793 109.016 P-1 atom x y z K .3044 .135 .300 D .0821 .7063 .537 C .2316 .5740 .9098 O1 .2082 .7732 .7452 O2 .1094 .3343 .7733 O3 .3723 .6392 .179