data_[Na6Ag8Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [4.2624]
_cell_length_b [7.7704]
_cell_length_c [14.9484]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Na3(AgSe)4]
_chemical_formula_sum '[Na6 Ag8 Se8]'
_cell_volume [495.0970]
_cell_formula_units_Z [2]
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
[
  Na  Na0  4  0.0000  0.0000  0.1049  1
  Na  Na1  2  0.0000  0.5000  0.0000  1
  Ag  Ag2  8  0.0000  0.1923  0.3294  1
  Se  Se3  4  0.0000  0.2795  0.5000  1
  Se  Se4  4  0.0000  0.5000  0.2345  1
]