data_[Rb12Na8Hg12]
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 [Cmcm]
_cell_length_a [5.2739]
_cell_length_b [14.5373]
_cell_length_c [17.6070]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Rb3Na2Hg3]
_chemical_formula_sum '[Rb12 Na8 Hg12]'
_cell_volume [1349.9037]
_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
[
  Rb  Rb0  8  0.0000  0.0660  0.6173  1
  Rb  Rb1  4  0.0000  0.3597  0.7500  1
  Na  Na2  8  0.0000  0.2237  0.0770  1
  Hg  Hg3  8  0.0000  0.4000  0.5332  1
  Hg  Hg4  4  0.0000  0.3287  0.2500  1
]