data_[Na4Nb8H4O24]
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
  H  2.2000  0.2500  0.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [11.9852]
_cell_length_b [7.5198]
_cell_length_c [6.0541]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.4868]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaNb2HO6]
_chemical_formula_sum '[Na4 Nb8 H4 O24]'
_cell_volume [517.4779]
_cell_formula_units_Z [4]
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  0.2235  0.2500  1
  Nb  Nb1  8  0.2393  0.0855  0.8154  1
  H  H2  4  0.0000  0.1346  0.7500  1
  O  O3  8  0.0800  0.1290  0.6697  1
  O  O4  8  0.1779  0.4295  0.4241  1
  O  O5  8  0.1914  0.1772  0.1294  1
]