data_[Rb8Na8Hg4]
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 [Cmc2_1]
_cell_length_a [5.2296]
_cell_length_b [21.6190]
_cell_length_c [9.3282]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [Rb2Na2Hg]
_chemical_formula_sum '[Rb8 Na8 Hg4]'
_cell_volume [1054.6224]
_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  4  0.0000  0.0560  0.2117  1.0
  Rb  Rb1  4  0.0000  0.2660  0.9134  1.0
  Na  Na2  4  0.0000  0.1237  0.6241  1.0
  Na  Na3  4  0.0000  0.4154  0.3652  1.0
  Hg  Hg4  4  0.0000  0.4492  0.0199  1.0
]