data_[Ba4Si4Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Si  1.9000  1.1000  0.5400
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [4.1160]
_cell_length_b [5.1070]
_cell_length_c [16.6945]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [BaSiHg]
_chemical_formula_sum '[Ba4 Si4 Hg4]'
_cell_volume [350.9225]
_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
[
  Ba  Ba0  4  0.0000  0.2500  0.3597  1
  Si  Si1  4  0.0000  0.2500  0.7881  1
  Hg  Hg2  4  0.0000  0.2500  0.9543  1
]