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 = 3.45 GPa _database_code_amcsd 0004372 6.3043 5.3587 4.2501 95.132 101.113 109.326 P-1 atom x y z K .302 .1326 .293 D .0836 .7055 .541 C .2329 .5738 .9117 O1 .2084 .7717 .7470 O2 .1110 .3341 .771 O3 .3731 .6425 .179