data_[Na4Pu4Si4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Pu  1.2800  1.7500  0.9675
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.0938]
_cell_length_b [9.0814]
_cell_length_c [7.7670]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.6501]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaPuSiO5]
_chemical_formula_sum '[Na4 Pu4 Si4 O20]'
_cell_volume [454.7626]
_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  0.3370  0.7500  1
  Pu  Pu1  4  0.0000  0.0000  0.0000  1
  Si  Si2  4  0.0000  0.3207  0.2500  1
  O  O3  8  0.0945  0.2165  0.1297  1
  O  O4  8  0.1790  0.4327  0.3954  1
  O  O5  4  0.0000  0.0807  0.7500  1
]