data_[Pm6Si4Ni18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Si  1.9000  1.1000  0.5400
  Ni  1.9100  1.3500  0.7400
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [3.9071]
_cell_length_b [9.4221]
_cell_length_c [11.9361]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Pm3Si2Ni9]
_chemical_formula_sum '[Pm6 Si4 Ni18]'
_cell_volume [439.4004]
_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
[
  Pm  Pm0  4  0.0000  0.0000  0.3085  1
  Pm  Pm1  2  0.0000  0.0000  0.0000  1
  Si  Si2  4  0.0000  0.2326  0.5000  1
  Ni  Ni3  8  0.0000  0.2803  0.1048  1
  Ni  Ni4  8  0.0000  0.3129  0.3083  1
  Ni  Ni5  2  0.0000  0.5000  0.0000  1
]