data_[Na4Si4Sb4O20]
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
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [6.8019]
_cell_length_b [8.7570]
_cell_length_c [7.2591]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.6827]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaSiSbO5]
_chemical_formula_sum '[Na4 Si4 Sb4 O20]'
_cell_volume [389.6605]
_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  0.3371  0.2500  1.0
  Si  Si1  4  0.0000  0.3158  0.7500  1.0
  Sb  Sb2  4  0.0000  0.0000  0.0000  1.0
  O  O3  8  0.1010  0.2080  0.6242  1.0
  O  O4  8  0.1878  0.4328  0.9069  1.0
  O  O5  4  0.0000  0.0835  0.2500  1.0
]