data_[Ac2Tb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Tb  1.1000  1.7500  0.9815
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [3.6278]
_cell_length_b [5.7360]
_cell_length_c [16.5584]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [AcTb4]
_chemical_formula_sum '[Ac2 Tb8]'
_cell_volume [344.5674]
_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
[
  Tb  Tb0  4  0.0000  0.0000  0.2840  1
  Tb  Tb1  4  0.0000  0.5000  0.3990  1
  Ac  Ac2  2  0.0000  0.5000  0.0000  1
]