data_[Na6Ag2Se4]
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 [Cmm2]
_cell_length_a [9.4960]
_cell_length_b [10.5658]
_cell_length_c [17.1727]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [35]
_chemical_formula_structural [Na3AgSe2]
_chemical_formula_sum '[Na6 Ag2 Se4]'
_cell_volume [1722.9879]
_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  0.2500  0.2500  0.4573  1
  Na  Na1  2  0.0000  0.5000  0.5838  1
  Ag  Ag2  2  0.0000  0.0000  0.5087  1
  Se  Se3  4  0.2400  0.5000  0.4965  1
]