data_[Na6Er3Ag3I18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Er  1.2400  1.7500  1.0300
  Ag  1.9300  1.6000  1.0867
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [7.9129]
_cell_length_b [7.9129]
_cell_length_c [22.4603]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Na2ErAgI6]
_chemical_formula_sum '[Na6 Er3 Ag3 I18]'
_cell_volume [1217.9107]
_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
[
  Na  Na0  3  0.0000  0.0000  0.0082  1.0
  Na  Na1  3  0.0000  0.0000  0.5269  1.0
  Er  Er2  3  0.0000  0.0000  0.3321  1.0
  Ag  Ag3  3  0.0000  0.0000  0.7451  1.0
  I  I4  9  0.0239  0.3438  0.9289  1.0
  I  I5  9  0.0330  0.6691  0.0876  1.0
]