data_[Na3Hf3Cr6O18]
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
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2411]
_cell_length_b [5.2411]
_cell_length_c [13.9474]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaHfCr2O6]
_chemical_formula_sum '[Na3 Hf3 Cr6 O18]'
_cell_volume [331.7924]
_cell_formula_units_Z [3]
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  3  0.0000  0.0000  0.7937  1
  Hf  Hf1  3  0.0000  0.0000  0.3074  1
  Cr  Cr2  3  0.0000  0.0000  0.0167  1
  Cr  Cr3  3  0.0000  0.0000  0.5177  1
  O  O4  9  0.0415  0.3421  0.5942  1
  O  O5  9  0.0902  0.7430  0.0834  1
]