data_[Na6Np4Cr2N12]
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
  Cr  1.6600  1.4000  0.9400
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.7096]
_cell_length_b [9.9121]
_cell_length_c [5.9473]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.3536]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Np2CrN6]
_chemical_formula_sum '[Na6 Np4 Cr2 N12]'
_cell_volume [319.4574]
_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  0.1585  0.5000  1
  Na  Na1  2  0.0000  0.5000  0.5000  1
  Np  Np2  4  0.0000  0.3333  0.0000  1
  Cr  Cr3  2  0.0000  0.0000  0.0000  1
  N  N4  8  0.2275  0.1656  0.1855  1
  N  N5  4  0.2299  0.5000  0.1856  1
]