data_[Na2Np2Cl8]
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
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [12.4272]
_cell_length_b [4.2660]
_cell_length_c [19.1425]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaNpCl4]
_chemical_formula_sum '[Na2 Np2 Cl8]'
_cell_volume [1014.8233]
_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  2  0.4015  0.2500  0.5644  1
  Np  Np1  2  0.1645  0.7500  0.4835  1
  Cl  Cl2  2  0.0609  0.2500  0.5579  1
  Cl  Cl3  2  0.1700  0.2500  0.3931  1
  Cl  Cl4  2  0.2712  0.7500  0.6082  1
  Cl  Cl5  2  0.3829  0.7500  0.4522  1
]