data_[Rb4Na4Er4F20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Er  1.2400  1.7500  1.0300
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.4935]
_cell_length_b [10.7412]
_cell_length_c [8.3670]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.4356]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [RbNaErF5]
_chemical_formula_sum '[Rb4 Na4 Er4 F20]'
_cell_volume [631.0698]
_cell_formula_units_Z [4]
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
[
  Rb  Rb0  4  0.0000  0.3349  0.7500  1.0
  Na  Na1  4  0.0000  0.3186  0.2500  1.0
  Er  Er2  4  0.0000  0.0000  0.0000  1.0
  F  F3  8  0.0896  0.1855  0.0895  1.0
  F  F4  8  0.2057  0.4477  0.4262  1.0
  F  F5  4  0.0000  0.0609  0.7500  1.0
]