data_[Rb1Na2Np1I8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  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 [P2/m]
_cell_length_a [6.7760]
_cell_length_b [10.5439]
_cell_length_c [7.8462]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.5442]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [RbNa2NpI8]
_chemical_formula_sum '[Rb1 Na2 Np1 I8]'
_cell_volume [560.3681]
_cell_formula_units_Z [1]
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
[
  Rb  Rb0  1  0.0000  0.5000  0.0000  1
  Na  Na1  2  0.5000  0.2271  0.5000  1
  Np  Np2  1  0.0000  0.0000  0.0000  1
  I  I3  4  0.2474  0.2069  0.8509  1
  I  I4  2  0.2443  0.0000  0.3278  1
  I  I5  2  0.2484  0.5000  0.4809  1
]