data_[Na6Pm6Pu6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Pm  1.1300  1.8500  1.1100
  Pu  1.2800  1.7500  0.9675
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [3.6135]
_cell_length_b [3.6135]
_cell_length_c [47.8216]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [NaPmPu]
_chemical_formula_sum '[Na6 Pm6 Pu6]'
_cell_volume [540.7579]
_cell_formula_units_Z [6]
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  6  0.0000  0.0000  0.1340  1
  Pm  Pm1  6  0.0000  0.0000  0.3999  1
  Pu  Pu2  6  0.0000  0.0000  0.3219  1
]