data_[Rb6Na4Hg18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [5.2542]
_cell_length_b [11.3937]
_cell_length_c [15.4478]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Rb3Na2Hg9]
_chemical_formula_sum '[Rb6 Na4 Hg18]'
_cell_volume [924.7762]
_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
[
  Rb  Rb0  4  0.0000  0.0000  0.2935  1
  Rb  Rb1  2  0.0000  0.0000  0.0000  1
  Na  Na2  4  0.0000  0.1879  0.5000  1
  Hg  Hg3  8  0.0000  0.2860  0.1332  1
  Hg  Hg4  8  0.0000  0.3580  0.3364  1
  Hg  Hg5  2  0.0000  0.5000  0.0000  1
]