data_[Na10Er2O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [3.5175]
_cell_length_b [6.3711]
_cell_length_c [13.0702]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Na5ErO4]
_chemical_formula_sum '[Na10 Er2 O8]'
_cell_volume [292.9061]
_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  8  0.0000  0.2359  0.1729  1
  Na  Na1  2  0.0000  0.0000  0.5000  1
  Er  Er2  2  0.0000  0.5000  0.5000  1
  O  O3  4  0.0000  0.2356  0.0000  1
  O  O4  4  0.0000  0.5000  0.3169  1
]