data_[K8Na8Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [I4_1/amd]
_cell_length_a [5.8195]
_cell_length_b [5.8195]
_cell_length_c [27.8971]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [141]
_chemical_formula_structural [K2Na2Hg]
_chemical_formula_sum '[K8 Na8 Hg4]'
_cell_volume [944.7887]
_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  8  0.0000  0.0000  0.1830  1.0
  Na  Na1  8  0.0000  0.0000  0.3215  1.0
  Hg  Hg2  4  0.0000  0.0000  0.5000  1.0
]