data_[Ag8Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cc]
_cell_length_a [6.8980]
_cell_length_b [6.5317]
_cell_length_c [6.1547]
_cell_angle_alpha [90.0000]
_cell_angle_beta [97.8439]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [9]
_chemical_formula_structural [Ag2Se]
_chemical_formula_sum '[Ag8 Se4]'
_cell_volume [274.7110]
_cell_formula_units_Z [4]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Ag  Ag0  4  0.0915  0.3848  0.8306  1.0
  Ag  Ag1  4  0.1663  0.0384  0.1701  1.0
  Se  Se2  4  0.3043  0.2985  0.4985  1.0
]