data_[Na8Si2O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-1]
_cell_length_a [5.6274]
_cell_length_b [5.6369]
_cell_length_c [8.5247]
_cell_angle_alpha [81.0880]
_cell_angle_beta [71.7050]
_cell_angle_gamma [67.6598]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Na4SiO4]
_chemical_formula_sum '[Na8 Si2 O8]'
_cell_volume [237.2796]
_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  2  0.0194  0.7661  0.9369  1.0
  Na  Na1  2  0.1031  0.2329  0.6711  1.0
  Na  Na2  2  0.2635  0.7426  0.5166  1.0
  Na  Na3  2  0.4520  0.7362  0.1075  1.0
  Si  Si4  2  0.3427  0.2242  0.2531  1.0
  O  O5  2  0.1536  0.0420  0.3060  1.0
  O  O6  2  0.2082  0.4632  0.1284  1.0
  O  O7  2  0.3487  0.3496  0.4137  1.0
  O  O8  2  0.3508  0.9563  0.8522  1.0
]