data_[Ac3Np3Nb6O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Np  1.3600  1.7500  1.0000
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.7991]
_cell_length_b [5.7991]
_cell_length_c [17.2279]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [AcNpNb2O8]
_chemical_formula_sum '[Ac3 Np3 Nb6 O24]'
_cell_volume [501.7529]
_cell_formula_units_Z [3]
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
[
  Ac  Ac0  3  -0.0000  0.0000  0.5000  1
  Np  Np1  3  0.0000  0.0000  0.0000  1
  Nb  Nb2  6  0.0000  0.0000  0.2929  1
  O  O3  18  0.0029  0.7225  0.6158  1
  O  O4  6  0.0000  0.0000  0.1863  1
]