data_global _chemical_name_mineral 'Archerite' loop_ _publ_author_name 'West J' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 74 _journal_year 1930 _journal_page_first 306 _journal_page_last 335 _publ_section_title ; A quantitative X-ray analysis of the structure of potassium dihydrogen phosphate (KH2PO4) _cod_database_code 1010458 ; _database_code_amcsd 0017377 _chemical_formula_sum 'K P O4 H2' _cell_length_a 7.43 _cell_length_b 7.43 _cell_length_c 6.97 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 384.778 _exptl_crystal_density_diffrn 2.349 _symmetry_space_group_name_H-M 'I -4 2 d' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' '1/2-y,-x,3/4+z' '-y,1/2-x,1/4+z' 'y,-x,-z' '1/2+y,1/2-x,1/2-z' '-x,1/2+y,1/4-z' '1/2-x,+y,3/4-z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' '1/2+y,x,3/4+z' '+y,1/2+x,1/4+z' '-y,x,-z' '1/2-y,1/2+x,1/2-z' 'x,1/2-y,1/4-z' '1/2+x,-y,3/4-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z K1 0.00000 0.00000 0.50000 P1 0.00000 0.00000 0.00000 O1 0.14400 0.08100 0.13900 H1 0.14500 0.25000 0.12500