data_global _chemical_name_mineral 'Tetradymite' loop_ _publ_author_name 'Harker D' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 89 _journal_year 1934 _journal_page_first 175 _journal_page_last 181 _publ_section_title ; The crystal structure of the mineral tetradymite, Bi2Te2S ; _database_code_amcsd 0010544 _chemical_compound_source 'Hungary' _chemical_formula_sum 'Bi2 Te2 S' _cell_length_a 10.33 _cell_length_b 10.33 _cell_length_c 10.33 _cell_angle_alpha 24.17 _cell_angle_beta 24.17 _cell_angle_gamma 24.17 _cell_volume 162.410 _exptl_crystal_density_diffrn 7.211 _symmetry_space_group_name_H-M 'R -3' loop_ _space_group_symop_operation_xyz 'x,y,z' '-z,-x,-y' 'y,z,x' '-x,-y,-z' 'z,x,y' '-y,-z,-x' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Bi 0.39200 0.39200 0.39200 Te 0.78800 0.78800 0.78800 S 0.00000 0.00000 0.00000