data_[Na4Np2Br16]
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
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [21.5633]
_cell_length_b [5.0815]
_cell_length_c [7.3578]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.1506]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2NpBr8]
_chemical_formula_sum '[Na4 Np2 Br16]'
_cell_volume [774.4105]
_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  0.2070  0.0000  0.8123  1
  Np  Np1  2  0.0000  0.5000  0.0000  1
  Br  Br2  4  0.0157  0.0000  0.2273  1
  Br  Br3  4  0.0840  0.5000  0.7784  1
  Br  Br4  4  0.1150  0.5000  0.2695  1
  Br  Br5  4  0.2382  0.0000  0.2211  1
]