data_[Na6Np4Al2Se12]
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
  Al  1.6100  1.2500  0.6750
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.1086]
_cell_length_b [12.3250]
_cell_length_c [7.3178]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.9609]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Np2AlSe6]
_chemical_formula_sum '[Na6 Np4 Al2 Se12]'
_cell_volume [606.3523]
_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  0.0000  0.1682  0.5000  1
  Na  Na1  2  0.0000  0.5000  0.5000  1
  Np  Np2  4  0.0000  0.3332  0.0000  1
  Al  Al3  2  0.0000  0.0000  0.0000  1
  Se  Se4  8  0.2293  0.1553  0.2217  1
  Se  Se5  4  0.2355  0.0000  0.7822  1
]