data_[Na6Nb2V4O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  V  1.6300  1.3500  0.7775
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.4455]
_cell_length_b [9.4255]
_cell_length_c [5.7593]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.3553]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3NbV2O6]
_chemical_formula_sum '[Na6 Nb2 V4 O12]'
_cell_volume [280.5642]
_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  1.0
  Na  Na1  2  0.0000  0.5000  0.5000  1.0
  Nb  Nb2  2  0.0000  0.0000  0.0000  1.0
  V  V3  4  0.0000  0.3335  0.0000  1.0
  O  O4  8  0.2272  0.1575  0.2091  1.0
  O  O5  4  0.2447  0.0000  0.7917  1.0
]