data_[Na8U8O28]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  U  1.3800  1.7500  0.9913
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [6.9472]
_cell_length_b [7.8658]
_cell_length_c [12.4375]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.3069]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2U2O7]
_chemical_formula_sum '[Na8 U8 O28]'
_cell_volume [628.7931]
_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  0.4965  0.2485  0.4992  1
  Na  Na1  2  0.0000  0.0000  0.0000  1
  Na  Na2  2  0.0000  0.0000  0.5000  1
  U  U3  4  0.0031  0.7488  0.2503  1
  U  U4  4  0.4578  0.0021  0.7410  1
  O  O5  4  0.1031  0.0020  0.7117  1
  O  O6  4  0.1056  0.2134  0.9102  1
  O  O7  4  0.1120  0.7118  0.4109  1
  O  O8  4  0.3189  0.2000  0.2618  1
  O  O9  4  0.3267  0.7115  0.7616  1
  O  O10  4  0.3610  0.0019  0.5798  1
  O  O11  4  0.4375  0.5027  0.5990  1
]