data_global _chemical_name_mineral 'Uranophane - alpha' loop_ _publ_author_name 'Stohl F V' 'Smith D K' _journal_name_full 'American Mineralogist' _journal_volume 66 _journal_year 1981 _journal_page_first 610 _journal_page_last 625 _publ_section_title ; The crystal chemistry of the uranyl silicate minerals Note: signs of y and z are changed for many of the atoms ; _database_code_amcsd 0000837 _chemical_compound_source 'Shinkolobwe, Katanga' _chemical_formula_sum 'U2 Si2 O16 Ca H8' _cell_length_a 15.858 _cell_length_b 6.985 _cell_length_c 6.641 _cell_angle_alpha 90 _cell_angle_beta 97.55 _cell_angle_gamma 90 _cell_volume 729.234 _exptl_crystal_density_diffrn 3.809 _symmetry_space_group_name_H-M 'P 1 21 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,1/2+y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv U1 0.25570 0.78220 0.13440 0.01013 U2 -0.25570 0.78220 0.13440 0.01013 Si1 0.28400 0.28100 0.33900 0.01013 Si2 -0.28400 0.28100 0.33900 0.01013 O1 0.37100 0.79500 0.13800 0.03420 O2 -0.37100 0.79500 0.13800 0.03420 O3 0.14300 0.75700 0.12300 0.01646 O4 -0.14300 0.75700 0.12300 0.01646 O5 0.27100 0.45300 0.18700 0.02660 O6 -0.27100 0.45300 0.18700 0.02660 O7 0.25800 0.09500 0.18100 0.02660 O8 -0.25800 0.09500 0.18100 0.02660 O9 0.22900 0.29200 0.52300 0.01267 O10 -0.22900 0.29200 0.52300 0.01267 O11 0.38100 0.27200 0.43200 0.02786 O12 -0.38100 0.27200 0.43200 0.02786 Wat1 0.06900 0.34500 0.35900 0.04559 Wat2 0.99100 0.01000 0.19600 0.01393 Wat3 0.93600 0.61000 0.55800 0.03673 Wat4 0.99300 0.50700 0.94500 0.03293 Ca 0.01900 0.67200 0.28000 0.03673