data_[Na4Ac4Nb4N12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ac  1.1000  1.9500  1.2600
  Nb  1.6000  1.4500  0.8200
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [5.8078]
_cell_length_b [11.5192]
_cell_length_c [5.6608]
_cell_angle_alpha [90.0000]
_cell_angle_beta [102.9193]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaAcNbN3]
_chemical_formula_sum '[Na4 Ac4 Nb4 N12]'
_cell_volume [369.1301]
_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  0.4335  0.7500  1
  Ac  Ac1  4  0.0000  0.2542  0.2500  1
  Nb  Nb2  4  0.0000  0.0487  0.7500  1
  N  N3  8  0.2095  0.0586  0.4817  1
  N  N4  4  0.0000  0.2243  0.7500  1
]