data_[Y8Np2O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Y  1.2200  1.8000  1.0400
  Np  1.3600  1.7500  1.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4/m]
_cell_length_a [8.5162]
_cell_length_b [8.5162]
_cell_length_c [5.3219]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [87]
_chemical_formula_structural [Y4NpO10]
_chemical_formula_sum '[Y8 Np2 O20]'
_cell_volume [385.9776]
_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
[
  Y  Y0  8  0.0985  0.6991  0.5000  1
  Np  Np1  2  0.0000  0.0000  0.0000  1
  O  O2  16  0.0971  0.1859  0.2356  1
  O  O3  4  0.0000  0.5000  0.2500  1
]