data_[Nb4Hg4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Nb  1.6000  1.4500  0.8200
  Hg  2.0000  1.5000  1.2450
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [6.9204]
_cell_length_b [9.8275]
_cell_length_c [5.5700]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.0568]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Nb2Hg2O7]
_chemical_formula_sum '[Nb4 Hg4 O14]'
_cell_volume [374.0936]
_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
[
  Nb  Nb0  4  0.2450  0.5000  0.1012  1.0
  Hg  Hg1  4  0.0000  0.3030  0.5000  1.0
  O  O2  8  0.2431  0.1613  0.7141  1.0
  O  O3  4  0.0735  0.5000  0.7986  1.0
  O  O4  2  0.0000  0.0000  0.0000  1.0
]