data_[K3Na6Er3F18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  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 [R3]
_cell_length_a [6.0020]
_cell_length_b [6.0020]
_cell_length_c [16.0307]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [KNa2ErF6]
_chemical_formula_sum '[K3 Na6 Er3 F18]'
_cell_volume [500.1270]
_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
[
  K  K0  3  0.0000  0.0000  0.8037  1.0
  Na  Na1  3  0.0000  0.0000  0.0158  1.0
  Na  Na2  3  0.0000  0.0000  0.5249  1.0
  Er  Er3  3  0.0000  0.0000  0.3191  1.0
  F  F4  9  0.0177  0.3384  0.9235  1.0
  F  F5  9  0.0868  0.7104  0.0759  1.0
]