data_[Na10Np2O10]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Np  1.3600  1.7500  1.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.0768]
_cell_length_b [4.6072]
_cell_length_c [6.6240]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.6461]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na5NpO5]
_chemical_formula_sum '[Na10 Np2 O10]'
_cell_volume [320.3020]
_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
[
  Na  Na0  4  0.1800  0.5000  0.8575  1
  Na  Na1  4  0.1997  0.5000  0.3298  1
  Na  Na2  2  0.0000  0.0000  0.5000  1
  Np  Np3  2  0.0000  0.0000  0.0000  1
  O  O4  4  0.1367  0.0000  0.8385  1
  O  O5  4  0.1487  0.0000  0.3018  1
  O  O6  2  0.0000  0.5000  0.0000  1
]