data_global _chemical_name_mineral 'Vivianite' loop_ _publ_author_name 'Mori H' 'Ito T' _journal_name_full 'Acta Crystallographica' _journal_volume 3 _journal_year 1950 _journal_page_first 1 _journal_page_last 6 _publ_section_title ; The structure of vivianite and symplesite ; _database_code_amcsd 0009138 _chemical_compound_source 'Ashio, Japan' _chemical_formula_sum 'Fe3 P2 O16 H16' _cell_length_a 10.08 _cell_length_b 13.43 _cell_length_c 4.70 _cell_angle_alpha 90 _cell_angle_beta 104.50 _cell_angle_gamma 90 _cell_volume 615.993 _exptl_crystal_density_diffrn 2.704 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z FeI 0.00000 0.00000 0.00000 FeII 0.00000 0.39000 0.00000 P 0.31500 0.00000 0.41000 OI 0.15500 0.00000 0.35000 OII 0.40000 0.00000 0.75000 OIII 0.36500 0.10000 0.24500 WatI 0.08500 0.11000 0.82000 WatII 0.40000 0.22000 0.75000