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