data_global
_amcsd_formula_title 'Ag2 Hg I4'
loop_
_publ_author_name
'Ketelaar J'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 80 
_journal_year 1931
_journal_page_first 190
_journal_page_last 203
_publ_section_title
;
 Strukturbestimmung der komplexen Quecksilber-Verbindungen Ag2 Hg I4
 und Cu2 Hg I4
 _cod_database_code 1010459
;
_database_code_amcsd 0017378
_chemical_formula_sum 'Hg Ag2 I4'
_cell_length_a 6.340
_cell_length_b 6.340
_cell_length_c 6.340
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 254.840
_exptl_crystal_density_diffrn      6.020
_symmetry_space_group_name_H-M 'P -4 2 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,z'
  'y,-x,-z'
  '-x,y,-z'
  '-x,-y,z'
  'y,x,z'
  '-y,x,-z'
  'x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Hg1   0.00000   0.00000   0.00000
Ag1   0.00000   0.50000   0.50000
I1   0.27000   0.27000   0.22500