data_global
_chemical_name_mineral 'Acanthite'
loop_
_publ_author_name
'Frueh A J'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 110 
_journal_year 1958
_journal_page_first 136
_journal_page_last 144
_publ_section_title
;
 The crystallography of silver sulfide, Ag2S
;
_database_code_amcsd 0010584
_chemical_compound_source 'Freiberg, Saxony, Germany'
_chemical_formula_sum 'Ag2 S'
_cell_length_a 4.23
_cell_length_b 6.91
_cell_length_c 7.87
_cell_angle_alpha 90
_cell_angle_beta 99.58
_cell_angle_gamma 90
_cell_volume 226.827
_exptl_crystal_density_diffrn      7.256
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-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
AgI   0.75800   0.01500   0.30500
AgII   0.28500   0.32000   0.43500
S   0.35900   0.23900   0.13400