data_[Na4Er4P8O24]
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
  P  2.1900  1.0000  0.5500
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.0617]
_cell_length_b [11.2862]
_cell_length_c [8.4602]
_cell_angle_alpha [90.0000]
_cell_angle_beta [98.4516]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaEr(PO3)2]
_chemical_formula_sum '[Na4 Er4 P8 O24]'
_cell_volume [666.9590]
_cell_formula_units_Z [4]
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  0.0982  0.7500  1.0
  Er  Er1  4  0.0000  0.3536  0.2500  1.0
  P  P2  8  0.1291  0.3696  0.6913  1.0
  O  O3  8  0.0693  0.3539  0.5115  1.0
  O  O4  8  0.2168  0.4933  0.7355  1.0
  O  O5  8  0.2460  0.2349  0.2365  1.0
]