data_global _chemical_name_mineral 'Boulangerite' loop_ _publ_author_name 'Born L' 'Hellner E' _journal_name_full 'American Mineralogist' _journal_volume 45 _journal_year 1960 _journal_page_first 1266 _journal_page_last 1271 _publ_section_title ; A structural proposal for boulangerite ; _database_code_amcsd 96 _chemical_compound_source 'Pribram, Bohemia' _chemical_formula_sum 'Pb4.5 Sb4.5 S11' _cell_length_a 42.28 _cell_length_b 23.46 _cell_length_c 8.07 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 90.0 _cell_volume 8004.542 _exptl_crystal_density_diffrn 3.042 _symmetry_space_group_name_H-M 'B b 21 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,y,1/2+z' '-x,1/2+y,z' '1/2-x,1/2+y,1/2+z' 'x,y,-z' '1/2+x,y,1/2-z' '-x,1/2+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_occupancy Pb1 0.307 0.16 0.25 1.0 Pb2 0.117 0.498 0.25 1.0 Pb3 0.206 0.323 0.25 1.0 Pb4 0.458 0.433 0.75 0.5 Sb4 0.458 0.433 0.75 0.5 Pb5 0.132 0.098 0.75 0.5 Sb5 0.132 0.098 0.75 0.5 Pb6 0.486 0.129 0.75 0.5 Sb6 0.486 0.129 0.75 0.5 Sb7 0.287 0.462 0.75 1.0 Sb8 0.046 0.232 0.25 1.0 Sb9a 0.388 0.283 0.75 0.5 Sb9b 0.372 0.307 0.75 0.5 S1 0.069 0.017 0.25 1.0 S2 0.247 0.028 0.25 1.0 S3 0.156 0.175 0.25 1.0 S4 0.42 0.219 0.25 1.0 S5 0.33 0.375 0.25 1.0 S6 0.372 0.088 0.75 1.0 S7 0.014 0.138 0.75 1.0 S8 0.278 0.251 0.75 1.0 S9 0.096 0.295 0.75 1.0 S10 0.186 0.415 0.75 1.0 S11 0.013 0.441 0.75 1.0