data_[Dy18Er6Se9]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Dy  1.2200  1.7500  1.1310
  Er  1.2400  1.7500  1.0300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [3.7859]
_cell_length_b [3.7859]
_cell_length_c [75.3072]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Dy6Er2Se3]
_chemical_formula_sum '[Dy18 Er6 Se9]'
_cell_volume [934.7782]
_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
[
  Dy  Dy0  6  0.0000  0.0000  0.0739  1
  Dy  Dy1  6  0.0000  0.0000  0.1851  1
  Dy  Dy2  6  0.0000  0.0000  0.3579  1
  Er  Er3  6  0.0000  0.0000  0.4443  1
  Se  Se4  6  0.0000  0.0000  0.2847  1
  Se  Se5  3  0.0000  0.0000  0.0000  1
]