data_[Na6Er4Al2O12]
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
  Al  1.6100  1.2500  0.6750
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.6051]
_cell_length_b [9.7357]
_cell_length_c [5.8192]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.4147]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Er2AlO6]
_chemical_formula_sum '[Na6 Er4 Al2 O12]'
_cell_volume [301.2941]
_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
[
  Na  Na0  4  0.0000  0.1562  0.5000  1.0
  Na  Na1  2  0.0000  0.5000  0.5000  1.0
  Er  Er2  4  0.0000  0.3328  0.0000  1.0
  Al  Al3  2  0.0000  0.0000  0.0000  1.0
  O  O4  8  0.2174  0.1511  0.2028  1.0
  O  O5  4  0.2358  0.0000  0.8029  1.0
]