data_[Na4Np4S4]
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
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [3.4031]
_cell_length_b [3.4031]
_cell_length_c [22.9405]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [NaNpS]
_chemical_formula_sum '[Na4 Np4 S4]'
_cell_volume [265.6707]
_cell_formula_units_Z [4]
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  0.0000  0.4229  1
  Np  Np1  4  0.0000  0.0000  0.2723  1
  S  S2  4  0.0000  0.0000  0.1532  1
]