data_[Na8V8O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  V  1.6300  1.3500  0.7775
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cc]
_cell_length_a [15.5168]
_cell_length_b [5.5754]
_cell_length_c [5.4111]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.3275]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [9]
_chemical_formula_structural [Na2V2O5]
_chemical_formula_sum '[Na8 V8 O20]'
_cell_volume [438.9686]
_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  0.1422  0.2206  0.8927  1.0
  Na  Na1  4  0.3574  0.2779  0.1071  1.0
  V  V2  4  0.2500  0.2512  0.5115  1.0
  V  V3  4  0.4999  0.1803  0.7082  1.0
  O  O4  4  0.1084  0.1896  0.3849  1.0
  O  O5  4  0.2384  0.4853  0.7402  1.0
  O  O6  4  0.2612  0.0173  0.2874  1.0
  O  O7  4  0.3916  0.3113  0.6675  1.0
  O  O8  4  0.4996  0.1203  0.3640  1.0
]