data_[Na2Np4I16]
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
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [16.3153]
_cell_length_b [12.0635]
_cell_length_c [6.1703]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.8716]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na(NpI4)2]
_chemical_formula_sum '[Na2 Np4 I16]'
_cell_volume [1214.2878]
_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  0.0000  0.0000  0.0000  1
  Np  Np1  4  0.2189  0.0000  0.7436  1
  I  I2  8  0.1036  0.1881  0.7490  1
  I  I3  4  0.1031  0.5000  0.2546  1
  I  I4  4  0.2154  0.0000  0.2382  1
]