data_[Ac4Mg2Hg8Pb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Mg  1.3100  1.5000  0.8600
  Hg  2.0000  1.5000  1.2450
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [7.0651]
_cell_length_b [7.0651]
_cell_length_c [10.4913]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Ac2Mg(Hg2Pb)2]
_chemical_formula_sum '[Ac4 Mg2 Hg8 Pb4]'
_cell_volume [523.6797]
_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  0.0000  0.5000  0.2500  1
  Mg  Mg1  2  0.0000  0.0000  0.0000  1
  Hg  Hg2  8  0.2246  0.2246  0.5000  1
  Pb  Pb3  4  0.0000  0.0000  0.2819  1
]