data_[Pm4Pr2Er6Se12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Pr  1.1300  1.8500  1.0600
  Er  1.2400  1.7500  1.0300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [18.1389]
_cell_length_b [4.0743]
_cell_length_c [8.3838]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.2995]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm2Pr(ErSe2)3]
_chemical_formula_sum '[Pm4 Pr2 Er6 Se12]'
_cell_volume [597.6346]
_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  0.1662  0.0000  0.3322  1
  Pr  Pr1  2  0.0000  0.5000  0.0000  1
  Er  Er2  4  0.1656  0.0000  0.8329  1
  Er  Er3  2  0.0000  0.5000  0.5000  1
  Se  Se4  4  0.0031  0.0000  0.7373  1
  Se  Se5  4  0.1635  0.5000  0.5919  1
  Se  Se6  4  0.1718  0.5000  0.0751  1
]