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 = 6.57 GPa _database_code_amcsd 0004377 6.0564 5.2610 4.2047 95.293 100.438 108.689 P-1 atom x y z K .299 .129 .296 D .084 .707 .532 C .2309 .573 .908 O1 .2100 .775 .747 O2 .110 .332 .776 O3 .376 .640 .178