data_[Ac8Si2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [P2/c]
_cell_length_a [6.9791]
_cell_length_b [9.1879]
_cell_length_c [6.8497]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.8012]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [13]
_chemical_formula_structural [Ac4Si]
_chemical_formula_sum '[Ac8 Si2]'
_cell_volume [413.2605]
_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
[
  Ac  Ac0  4  0.2363  0.3581  0.0379  1
  Ac  Ac1  4  0.2579  0.1029  0.5272  1
  Si  Si2  2  0.5000  0.3759  0.7500  1
]