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 = 6.02 GPa _database_code_amcsd 0004376 6.0938 5.2765 4.2139 95.306 100.539 108.786 P-1 atom x y z K .305 .134 .296 D .0855 .7056 .539 C .2322 .5739 .9090 O1 .2111 .7779 .748 O2 .1110 .3325 .776 O3 .3743 .6403 .179