data_[Na4Si4W4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Si  1.9000  1.1000  0.5400
  W  2.3600  1.3500  0.7667
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [6.8548]
_cell_length_b [8.7961]
_cell_length_c [7.4374]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.2423]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaSiWO5]
_chemical_formula_sum '[Na4 Si4 W4 O20]'
_cell_volume [405.6203]
_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  0.3309  0.7500  1.0
  Si  Si1  4  0.0000  0.3182  0.2500  1.0
  W  W2  4  0.0000  0.0000  0.0000  1.0
  O  O3  8  0.0909  0.2117  0.1191  1.0
  O  O4  8  0.1903  0.4343  0.3946  1.0
  O  O5  4  0.0000  0.0680  0.7500  1.0
]