data_[Na28Cr8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [15.0237]
_cell_length_b [5.8473]
_cell_length_c [10.6290]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.9221]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [Na7Cr2O6]
_chemical_formula_sum '[Na28 Cr8 O24]'
_cell_volume [902.2547]
_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  8  0.0599  0.3581  0.6501  1
  Na  Na1  8  0.1682  0.4094  0.4047  1
  Na  Na2  8  0.2256  0.0400  0.8079  1
  Na  Na3  4  0.0000  0.0780  0.2500  1
  Cr  Cr4  8  0.1175  0.1073  0.0385  1
  O  O5  8  0.0980  0.2307  0.8747  1
  O  O6  8  0.1231  0.2779  0.1856  1
  O  O7  8  0.1754  0.1677  0.5797  1
]