data_global _chemical_name_mineral 'Geocronite' loop_ _publ_author_name 'Birnie R W' 'Burnham C W' _journal_name_full 'American Mineralogist' _journal_volume 61 _journal_year 1976 _journal_page_first 963 _journal_page_last 970 _publ_section_title ; The crystal structure and extent of solid solution of geocronite ; _database_code_amcsd 0000530 _chemical_formula_sum 'Pb15 Sb4 As2 S24' _cell_length_a 8.963 _cell_length_b 31.93 _cell_length_c 8.500 _cell_angle_alpha 90 _cell_angle_beta 118.02 _cell_angle_gamma 90 _cell_volume 2147.462 _exptl_crystal_density_diffrn 6.982 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-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 Pb1 0.44500 0.05660 0.35000 0.01646 Pb2 0.44100 0.04860 0.84400 0.01773 Pb3 0.90300 0.04380 0.32200 0.01646 Sb4 0.92200 0.04650 0.83600 0.01013 Pb5 0.26300 0.14140 0.00100 0.01900 As6 0.27100 0.15050 0.51100 0.00380 Pb7 0.78800 0.14870 0.01800 0.02026 Pb8 0.79000 0.15320 0.51600 0.01520 Pb9 0.12000 0.25000 0.17500 0.02786 Pb10 0.12100 0.25000 0.69100 0.01900 Sb11 0.61300 0.22140 0.18000 0.00633 Pb12 0.54700 0.25000 0.63800 0.03800 S1 0.28700 0.00200 0.00000 0.01900 S2 0.30700 0.00200 0.54700 0.03800 S3 0.05000 0.08500 0.11300 0.00253 S4 0.06300 0.08500 0.68600 0.02406 S5 0.65600 0.10000 0.19600 ? S6 0.65400 0.09000 0.70400 0.00380 S7 0.40900 0.17800 0.37000 0.01520 S8 0.40500 0.18000 0.78400 0.00887 S9 0.02500 0.18300 0.38700 -0.00507 S10 0.98600 0.20200 0.88200 0.03673 S11 0.37000 0.26100 0.05100 -0.01900 S12 0.74900 0.25000 0.02100 0.02153 S13 0.74600 0.25000 0.45500 -0.00253