data_[Na4Ag4P4Se16]
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
  P  2.1900  1.0000  0.5500
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [7.7209]
_cell_length_b [12.4602]
_cell_length_c [7.9350]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [NaAgPSe4]
_chemical_formula_sum '[Na4 Ag4 P4 Se16]'
_cell_volume [763.3759]
_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
[
  Na  Na0  4  0.0000  0.5000  0.0000  1
  Ag  Ag1  4  0.0000  0.1352  0.7500  1
  P  P2  4  0.0000  0.1492  0.2500  1
  Se  Se3  8  0.0000  0.2540  0.0239  1
  Se  Se4  8  0.2196  0.0318  0.2500  1
]