data_[K20Rb4Na8Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  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 [4.5441]
_cell_length_b [22.6120]
_cell_length_c [20.5153]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [K5RbNa2Hg]
_chemical_formula_sum '[K20 Rb4 Na8 Hg4]'
_cell_volume [2107.9786]
_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
[
  K  K0  4  0.0000  0.0344  0.0706  1.0
  K  K1  4  0.0000  0.2247  0.3404  1.0
  K  K2  4  0.0000  0.2957  0.6209  1.0
  K  K3  4  0.0000  0.3571  0.0425  1.0
  Rb  Rb4  4  0.0000  0.4018  0.3961  1.0
  K  K5  4  0.0000  0.4585  0.7508  1.0
  Na  Na6  4  0.0000  0.0622  0.4091  1.0
  Na  Na7  4  0.0000  0.1279  0.7178  1.0
  Hg  Hg8  4  0.0000  0.2086  0.9760  1.0
]