data_[Na2Cu2Sb4]
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 [P2_1/m]
_cell_length_a [5.0344]
_cell_length_b [4.2655]
_cell_length_c [9.7259]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.1591]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaCuSb2]
_chemical_formula_sum '[Na2 Cu2 Sb4]'
_cell_volume [202.5135]
_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  2  0.4859  0.2500  0.7931  1
  Cu  Cu1  2  0.1935  0.2500  0.3495  1
  Sb  Sb2  2  0.0694  0.7500  0.9134  1
  Sb  Sb3  2  0.2529  0.7500  0.5149  1
]