data_[Na4Cu4Sb6]
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
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.4739]
_cell_length_b [4.2321]
_cell_length_c [7.6616]
_cell_angle_alpha [90.0000]
_cell_angle_beta [117.9170]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Cu2Sb3]
_chemical_formula_sum '[Na4 Cu4 Sb6]'
_cell_volume [328.7416]
_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  0.1542  0.5000  0.8087  1.0
  Cu  Cu1  4  0.1280  0.5000  0.2621  1.0
  Sb  Sb2  4  0.1173  0.0000  0.4678  1.0
  Sb  Sb3  2  0.0000  0.0000  0.0000  1.0
]