data_[Na4Cu4S4]
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
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [9.5058]
_cell_length_b [5.1113]
_cell_length_c [5.6920]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [NaCuS]
_chemical_formula_sum '[Na4 Cu4 S4]'
_cell_volume [276.5557]
_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  0.1466  0.2500  0.0218  1
  Cu  Cu1  4  0.0000  0.0000  0.5000  1
  S  S2  4  0.1060  0.7500  0.2523  1
]