data_global _chemical_name_mineral 'Kochkarite' loop_ _publ_author_name 'Talybov A G' 'Vainshtein B K' _journal_name_full 'Soviet Physics Crystallography' _journal_volume 6 _journal_year 1962 _journal_page_first 432 _journal_page_last 438 _publ_section_title ; An electron diffraction study of the structure of PbBi4Te7 Loality: synthetic ; _database_code_amcsd 0015543 _chemical_formula_sum 'Bi3 Te5.25 Pb.75' _cell_length_a 4.50 _cell_length_b 4.50 _cell_length_c 17.600 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 308.651 _exptl_crystal_density_diffrn 7.813 _symmetry_space_group_name_H-M 'P -3 m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-y,-x,z' 'y,-x+y,-z' '-x,-x+y,-z' '-x+y,-x,z' '-x+y,y,z' '-x,-y,-z' 'y,x,-z' '-y,x-y,z' 'x,x-y,z' 'x-y,x,-z' 'x-y,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Bi1 0.00000 0.00000 0.00000 1.00000 Te2 0.33333 0.66667 0.11000 1.00000 Te1 0.00000 0.00000 0.33333 0.81250 Pb1 0.00000 0.00000 0.33333 0.18750 Te3 0.33333 0.66667 0.44400 0.81250 Pb2 0.33333 0.66667 0.44400 0.18750 Bi2 0.33333 0.66667 0.77800 1.00000