data_[Ac4Cr4Ni16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Cr  1.6600  1.4000  0.9400
  Ni  1.9100  1.3500  0.7400
]
_symmetry_space_group_name_H-M [F-43m]
_cell_length_a [7.1719]
_cell_length_b [7.1719]
_cell_length_c [7.1719]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [216]
_chemical_formula_structural [AcCrNi4]
_chemical_formula_sum '[Ac4 Cr4 Ni16]'
_cell_volume [368.8996]
_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
[
  Ac  Ac0  4  0.2500  0.2500  0.7500  1
  Cr  Cr1  4  0.0000  0.0000  0.0000  1
  Ni  Ni2  16  0.1268  0.1268  0.3732  1
]