data_[Sm3Tm3I18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Tm  1.2500  1.7500  1.0950
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [7.6337]
_cell_length_b [7.6337]
_cell_length_c [20.7426]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [SmTmI6]
_chemical_formula_sum '[Sm3 Tm3 I18]'
_cell_volume [1046.7897]
_cell_formula_units_Z [3]
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  3  0.0000  0.0000  0.0000  1.0
  Tm  Tm1  3  -0.0000  0.0000  0.5000  1.0
  I  I2  18  0.0042  0.6775  0.5821  1.0
]