data_[Na4Cu4Sb2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  Sb  2.0500  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.0733]
_cell_length_b [3.9144]
_cell_length_c [7.4673]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.2589]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Cu2SbSe4]
_chemical_formula_sum '[Na4 Cu4 Sb2 Se8]'
_cell_volume [401.6832]
_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  0.1332  0.0000  0.5567  1.0
  Cu  Cu1  4  0.1932  0.5000  0.9922  1.0
  Sb  Sb2  2  0.0000  0.0000  0.0000  1.0
  Se  Se3  4  0.0180  0.5000  0.7425  1.0
  Se  Se4  4  0.2073  0.0000  0.2042  1.0
]