data_[Na6Cu4Sb2O12]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.8848]
_cell_length_b [8.9689]
_cell_length_c [5.9504]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.9215]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Cu2SbO6]
_chemical_formula_sum '[Na6 Cu4 Sb2 O12]'
_cell_volume [284.8192]
_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  0.0000  0.1722  0.5000  1
  Na  Na1  2  0.0000  0.5000  0.5000  1
  Cu  Cu2  4  0.0000  0.3316  0.0000  1
  Sb  Sb3  2  0.0000  0.0000  0.0000  1
  O  O4  8  0.1956  0.1640  0.2259  1
  O  O5  4  0.2445  0.5000  0.1661  1
]