data_[U4Si12Ni20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  U  1.3800  1.7500  0.9913
  Si  1.9000  1.1000  0.5400
  Ni  1.9100  1.3500  0.7400
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.6268]
_cell_length_b [11.7552]
_cell_length_c [11.5052]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [USi3Ni5]
_chemical_formula_sum '[U4 Si12 Ni20]'
_cell_volume [490.5086]
_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
[
  U  U0  4  0.0000  0.1551  0.2500  1
  Si  Si1  8  0.0000  0.3834  0.5440  1
  Si  Si2  4  0.0000  0.1200  0.7500  1
  Ni  Ni3  8  0.0000  0.1973  0.5654  1
  Ni  Ni4  8  0.0000  0.4464  0.1452  1
  Ni  Ni5  4  0.0000  0.0000  0.0000  1
]