data_[Pu4Si8Ag8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pu  1.2800  1.7500  0.9675
  Si  1.9000  1.1000  0.5400
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [4.0532]
_cell_length_b [4.1347]
_cell_length_c [22.2250]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Pu(SiAg)2]
_chemical_formula_sum '[Pu4 Si8 Ag8]'
_cell_volume [372.4703]
_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
[
  Pu  Pu0  4  0.0000  0.2500  0.5763  1
  Si  Si1  4  0.0000  0.2500  0.0260  1
  Si  Si2  4  0.0000  0.2500  0.1298  1
  Ag  Ag3  4  0.0000  0.2500  0.2992  1
  Ag  Ag4  4  0.0000  0.2500  0.7986  1
]