data_[Na8Ac4Se4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ac  1.1000  1.9500  1.2600
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [7.1857]
_cell_length_b [7.1857]
_cell_length_c [10.3291]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [Na2AcSeO5]
_chemical_formula_sum '[Na8 Ac4 Se4 O20]'
_cell_volume [533.3398]
_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  8  0.1919  0.3081  0.0000  1
  Ac  Ac1  4  0.0000  0.0000  0.2500  1
  Se  Se2  4  0.0000  0.5000  0.2500  1
  O  O3  16  0.1493  0.3507  0.3422  1
  O  O4  4  0.0000  0.0000  0.0000  1
]