data_global _chemical_name_mineral 'Hydroromarchite' loop_ _publ_author_name 'Abrahams I' 'Grimes S M' 'Johnston S R' 'Knowles J C' _journal_name_full 'Acta Crystallographica, Section C' _journal_volume 52 _journal_year 1996 _journal_page_first 286 _journal_page_last 288 _publ_section_title ; Tin(II) oxyhydroxide by X-ray powder diffraction ; _database_code_amcsd 0010306 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Sn3 O4 H2' _cell_length_a 7.9268 _cell_length_b 7.9268 _cell_length_c 9.1025 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 571.948 _exptl_crystal_density_diffrn 4.902 _symmetry_space_group_name_H-M 'P -4 21 c' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2-y,1/2-x,1/2+z' 'y,-x,-z' '1/2-x,1/2+y,1/2-z' '-x,-y,z' '1/2+y,1/2+x,1/2+z' '-y,x,-z' '1/2+x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Sn1 0.12180 0.29170 -0.00380 0.02700 Sn2 0.00000 0.00000 0.27570 0.03200 O2 -0.09740 0.19450 0.12770 0.01900 O-H1 0.26060 0.09000 0.17300 0.01900