data_[Na4Zn8Se8O28]
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
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [13.5642]
_cell_length_b [6.2732]
_cell_length_c [8.3532]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [NaZn2Se2O7]
_chemical_formula_sum '[Na4 Zn8 Se8 O28]'
_cell_volume [710.7922]
_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  0.2474  0.2500  0.6360  1
  Zn  Zn1  4  0.0000  0.0000  0.0000  1
  Zn  Zn2  4  0.1122  0.2500  0.2786  1
  Se  Se3  4  0.0246  0.7500  0.3857  1
  Se  Se4  4  0.1724  0.7500  0.7718  1
  O  O5  8  0.0157  0.5339  0.2560  1
  O  O6  8  0.2434  0.0477  0.2949  1
  O  O7  4  0.0822  0.2500  0.0413  1
  O  O8  4  0.0899  0.2500  0.5245  1
  O  O9  4  0.1142  0.7500  0.9627  1
]