data_[Na6Np4Ag2Se12]
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
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.1422]
_cell_length_b [12.3501]
_cell_length_c [7.3669]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.8546]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Np2AgSe6]
_chemical_formula_sum '[Na6 Np4 Ag2 Se12]'
_cell_volume [614.9382]
_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  0.1605  0.5000  1
  Na  Na1  2  0.0000  0.5000  0.5000  1
  Np  Np2  4  0.0000  0.3327  0.0000  1
  Ag  Ag3  2  0.0000  0.0000  0.0000  1
  Se  Se4  8  0.2499  0.3267  0.7706  1
  Se  Se5  4  0.2300  0.5000  0.2293  1
]