data_[Tb6Tm6Se18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Tm  1.2500  1.7500  1.0950
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [7.1695]
_cell_length_b [7.1695]
_cell_length_c [19.4012]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [TbTmSe3]
_chemical_formula_sum '[Tb6 Tm6 Se18]'
_cell_volume [863.6393]
_cell_formula_units_Z [6]
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
[
  Tb  Tb0  6  0.0000  0.0000  0.3490  1
  Tm  Tm1  6  0.0000  0.0000  0.1536  1
  Se  Se2  18  0.0055  0.3080  0.7508  1
]