data_[Na2Er1Al1O4]
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 [P2/m]
_cell_length_a [5.4613]
_cell_length_b [3.1814]
_cell_length_c [5.7879]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.6176]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Na2ErAlO4]
_chemical_formula_sum '[Na2 Er1 Al1 O4]'
_cell_volume [95.3007]
_cell_formula_units_Z [1]
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  1  0.0000  0.5000  0.5000  1
  Na  Na1  1  0.5000  0.0000  0.5000  1
  Er  Er2  1  0.5000  0.5000  0.0000  1
  Al  Al3  1  0.0000  0.0000  0.0000  1
  O  O4  2  0.2107  0.5000  0.1988  1
  O  O5  2  0.2315  0.0000  0.8006  1
]