data_[Na8U4Sn4Se20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  U  1.3800  1.7500  0.9913
  Sn  1.9600  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmc2_1]
_cell_length_a [4.1878]
_cell_length_b [17.4960]
_cell_length_c [13.8895]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [Na2USnSe5]
_chemical_formula_sum '[Na8 U4 Sn4 Se20]'
_cell_volume [1017.6851]
_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  0.0953  0.6642  1
  Na  Na1  4  0.0000  0.1283  0.3121  1
  U  U2  4  0.0000  0.2288  0.0324  1
  Sn  Sn3  4  0.0000  0.4600  0.4365  1
  Se  Se4  4  0.0000  0.0635  0.0588  1
  Se  Se5  4  0.0000  0.2704  0.6654  1
  Se  Se6  4  0.0000  0.2997  0.3987  1
  Se  Se7  4  0.0000  0.3787  0.9950  1
  Se  Se8  4  0.0000  0.4961  0.7608  1
]