data_global _chemical_name_mineral 'Sklodowskite' loop_ _publ_author_name 'Mokeeva V I' _journal_name_full 'Soviet Physics Crystallography' _journal_volume 9 _journal_year 1964 _journal_page_first 217 _journal_page_last 218 _publ_section_title ; The structure of sklodowskite ; _database_code_amcsd 0015548 _chemical_formula_sum 'Mg U2 Si2 O18 H12' _cell_length_a 16.89 _cell_length_b 7.01 _cell_length_c 6.60 _cell_angle_alpha 90 _cell_angle_beta 96.33 _cell_angle_gamma 90 _cell_volume 776.669 _exptl_crystal_density_diffrn 3.663 _symmetry_space_group_name_H-M 'I 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,-y,z' '1/2+x,1/2-y,1/2+z' '-x,y,-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-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 Mg 0.00000 0.00000 0.50000 0.03166 U 0.25700 0.00000 0.12000 0.03166 Si 0.21800 0.00000 0.57000 0.03166 OSi1 0.28000 0.00000 0.78000 0.03166 OSi2 0.12800 0.00000 0.62700 0.03166 OSi3 0.23500 0.18700 0.44000 0.03166 OU1 0.15500 0.00000 0.03500 0.03166 OU2 0.35500 0.00000 0.18500 0.03166 Wat 0.02000 0.21000 0.30000 0.03166 WatX 0.08000 0.50000 0.82000 0.03166