data_[Na6Cu18Sb18]
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 [R-3]
_cell_length_a [6.4718]
_cell_length_b [6.4718]
_cell_length_c [27.0102]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Na(CuSb)3]
_chemical_formula_sum '[Na6 Cu18 Sb18]'
_cell_volume [979.7404]
_cell_formula_units_Z [6]
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  6  0.0000  0.0000  0.3490  1
  Cu  Cu1  18  0.0002  0.7672  0.4638  1
  Sb  Sb2  18  0.0008  0.5842  0.5816  1
]