data_[Na4Zn2Si2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Zn  1.6500  1.3500  0.8800
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmn2_1]
_cell_length_a [6.2552]
_cell_length_b [6.1564]
_cell_length_c [5.3772]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Na2ZnSiO4]
_chemical_formula_sum '[Na4 Zn2 Si2 O8]'
_cell_volume [207.0704]
_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  0.2463  0.6681  0.9911  1.0
  Zn  Zn1  2  0.0000  0.8607  0.4996  1.0
  Si  Si2  2  0.0000  0.1578  0.0014  1.0
  O  O3  4  0.2189  0.2985  0.9235  1.0
  O  O4  2  0.0000  0.1299  0.3055  1.0
  O  O5  2  0.0000  0.9184  0.8642  1.0
]