data_[U2Si2Ni6]
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 [Pmmn]
_cell_length_a [4.2271]
_cell_length_b [5.7423]
_cell_length_c [5.7912]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [USiNi3]
_chemical_formula_sum '[U2 Si2 Ni6]'
_cell_volume [140.5733]
_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
[
  U  U0  2  0.0000  0.5000  0.7164  1
  Si  Si1  2  0.0000  0.0000  0.9381  1
  Ni  Ni2  4  0.0000  0.2975  0.2262  1
  Ni  Ni3  2  0.0000  0.0000  0.5581  1
]