data_[Na2Hf2H4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Hf  1.3000  1.5500  0.8500
  H  2.2000  0.2500  0.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I222]
_cell_length_a [4.8053]
_cell_length_b [5.1415]
_cell_length_c [5.7613]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [23]
_chemical_formula_structural [NaHf(HO2)2]
_chemical_formula_sum '[Na2 Hf2 H4 O8]'
_cell_volume [142.3419]
_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  2  0.0000  0.0000  0.5000  1
  Hf  Hf1  2  0.0000  0.0000  0.0000  1
  H  H2  4  0.0000  0.5000  0.2816  1
  O  O3  8  0.1974  0.3535  0.7205  1
]