data_global _chemical_name_mineral 'Sillenite' loop_ _publ_author_name 'Sillen L' _journal_name_full 'Arkiv for Kemi, Mineralogi och Geologi' _journal_volume A12 _journal_year 1938 _journal_page_first 1 _journal_page_last 15 _publ_section_title ; X-Ray studies on bismuth trioxide _cod_database_code 1010314 ; _database_code_amcsd 0017240 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Bi12 O20 Si' _cell_length_a 10.08 _cell_length_b 10.08 _cell_length_c 10.08 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1024.193 _exptl_crystal_density_diffrn 9.260 _symmetry_space_group_name_H-M 'I 2 3' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' '-z,-x,y' '1/2-z,1/2-x,1/2+y' '-z,x,-y' '1/2-z,1/2+x,1/2-y' 'z,-x,-y' '1/2+z,1/2-x,1/2-y' 'z,x,y' '1/2+z,1/2+x,1/2+y' 'y,-z,-x' '1/2+y,1/2-z,1/2-x' '-y,-z,x' '1/2-y,1/2-z,1/2+x' '-y,z,-x' '1/2-y,1/2+z,1/2-x' 'y,z,x' '1/2+y,1/2+z,1/2+x' '-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 Bi1 0.32000 0.18000 0.02000 O1 0.37000 -0.02000 0.16000 O2 0.23000 0.23000 0.23000 O3 -0.11000 -0.11000 -0.11000 Si1 0.00000 0.00000 0.00000