data_global
_chemical_name_mineral 'Perroudite'
loop_
_publ_author_name
'Mumme W G'
'Nickel E H'
_journal_name_full 'American Mineralogist'
_journal_volume 72 
_journal_year 1987
_journal_page_first 1257
_journal_page_last 1262
_publ_section_title
;
 Crystal structure and crystal chemistry of perroudite:
 A mineral from Coppin Pool, Western Australia
;
_database_code_amcsd 0001135
_chemical_formula_sum 'Hg4.1 Ag4.4 S4.1 Cl2 Br.8 I1.6'
_cell_length_a 17.43
_cell_length_b 12.24
_cell_length_c 4.35
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 928.043
_exptl_crystal_density_diffrn      6.321
_symmetry_space_group_name_H-M 'P 21 21 2'
loop_
_space_group_symop_operation_xyz
  '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_occupancy
_atom_site_U_iso_or_equiv
Hg1   0.00000   0.00000   0.33990   0.50000   0.02310
Hg2   0.15890   0.17430   0.37760   1.00000   0.02250
Hg3   0.09310   0.42300   0.99880   0.80000   0.01950
Ag3   0.09310   0.42300   0.99880   0.20000   0.01950
Ag1   0.31120   0.39670   0.13280   1.00000   0.04260
Ag2   0.42130   0.18530   0.42290   1.00000   0.06650
S1   0.00000   0.50000   0.64410   0.50000   0.01940
S2   0.13040  -0.01730   0.32290   0.90000   0.01470
Cl2   0.13040  -0.01730   0.32290   0.10000   0.01470
S3   0.17870   0.36580   0.37930   0.90000   0.01530
Cl3   0.17870   0.36580   0.37930   0.10000   0.01530
Cl4   0.01800   0.18970   0.85990   0.80000   0.02410
Br4   0.01800   0.18970   0.85990   0.20000   0.02410
Br5   0.31350   0.16940   0.87810   0.20000   0.02180
I5   0.31350   0.16940   0.87810   0.80000   0.02180