data_[Sm1Gd1Si2I2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Gd  1.2000  1.8000  1.0750
  Si  1.9000  1.1000  0.5400
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [P3m1]
_cell_length_a [4.1507]
_cell_length_b [4.1507]
_cell_length_c [12.3085]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [156]
_chemical_formula_structural [SmGd(SiI)2]
_chemical_formula_sum '[Sm1 Gd1 Si2 I2]'
_cell_volume [183.6402]
_cell_formula_units_Z [1]
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
[
  Sm  Sm0  1  0.0000  0.0000  0.3435  1
  Gd  Gd1  1  0.0000  0.0000  0.6565  1
  Si  Si2  1  0.3333  0.6667  0.5082  1
  Si  Si3  1  0.6667  0.3333  0.4955  1
  I  I4  1  0.3333  0.6667  0.1722  1
  I  I5  1  0.6667  0.3333  0.8242  1
]