data_global _chemical_name_mineral 'Francisite' loop_ _publ_author_name 'Pring A' 'Gatehouse B M' 'Birch W D' _journal_name_full 'American Mineralogist' _journal_volume 75 _journal_year 1990 _journal_page_first 1421 _journal_page_last 1425 _publ_section_title ; Francisite, Cu3Bi(SeO3)2O2Cl, a new mineral from Iron Monarch, South Australia: Description and crystal structure ; _database_code_amcsd 0001339 _chemical_formula_sum 'Bi Cu3 Se2 Cl O8' _cell_length_a 6.354 _cell_length_b 9.630 _cell_length_c 7.220 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 441.785 _exptl_crystal_density_diffrn 5.420 _symmetry_space_group_name_H-M 'P m m n' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,y,z' '1/2+x,-y,-z' '1/2+x,1/2+y,-z' '1/2-x,1/2-y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Bi 0.25000 0.25000 0.24160 ? Cu1 0.00000 0.00000 0.00000 ? Cu2 0.25000 0.25000 0.79220 ? Se 0.25000 0.55700 0.60960 ? Cl 0.25000 0.75000 0.14880 ? O1 0.25000 0.11130 0.99410 0.00740 O2 0.04090 0.58360 0.75520 0.01570 O3 0.25000 0.11730 0.58720 0.01690 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Bi 0.00660 0.00640 0.00820 0.00000 0.00000 0.00000 Cu1 0.01160 0.00550 0.01230 -0.00870 0.00410 -0.00690 Cu2 0.03220 0.00610 0.00270 0.00000 0.00000 0.00000 Se 0.00720 0.00640 0.00920 0.00000 0.00000 0.00080 Cl 0.04740 0.03450 0.01720 0.00000 0.00000 0.00000