data_global _chemical_name_mineral 'Fornacite' loop_ _publ_author_name 'Cocco G' 'Fanfani L' 'Zanazzi P F' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 124 _journal_year 1967 _journal_page_first 385 _journal_page_last 397 _publ_section_title ; The crystal structure of fornacite ; _database_code_amcsd 0010641 _chemical_compound_source 'Reneville, Congo' _chemical_formula_sum 'Pb2 Cu (As.925 P.075) Cr O9 H' _cell_length_a 8.101 _cell_length_b 5.893 _cell_length_c 17.547 _cell_angle_alpha 90 _cell_angle_beta 110.00 _cell_angle_gamma 90 _cell_volume 787.161 _exptl_crystal_density_diffrn 6.300 _symmetry_space_group_name_H-M 'P 1 21/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Pb1 0.21940 0.21970 0.37570 1.00000 0.02432 Pb2 0.22250 0.77310 0.05890 1.00000 0.02115 Cu 0.48590 0.50820 0.24860 1.00000 0.01684 As 0.48650 0.25950 0.08140 0.92500 0.02039 P 0.48650 0.25950 0.08140 0.07500 0.02039 Cr 0.05040 0.25970 0.15890 1.00000 0.01330 O1 0.54090 0.02820 0.13770 1.00000 0.03166 O2 0.47230 0.47790 0.13220 1.00000 0.03166 O3 0.29010 0.20880 0.01490 1.00000 0.03166 O4 0.63770 0.31530 0.04760 1.00000 0.03166 O5 0.99410 0.03160 0.10190 1.00000 0.03166 O6 0.00440 0.47260 0.09440 1.00000 0.03166 O7 0.25010 0.24780 0.21350 1.00000 0.03166 O8 0.92710 0.28890 0.21820 1.00000 0.03166 O-H 0.34400 0.76070 0.21920 1.00000 0.03166