data_[Ba4Hg4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Hg  2.0000  1.5000  1.2450
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [4.4536]
_cell_length_b [11.7617]
_cell_length_c [10.0083]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [BaHgSe2]
_chemical_formula_sum '[Ba4 Hg4 Se8]'
_cell_volume [524.2576]
_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  0.5000  0.2107  0.6644  1.0
  Hg  Hg1  2  0.0000  0.0000  0.3865  1.0
  Hg  Hg2  2  0.0000  0.0000  0.9721  1.0
  Se  Se3  4  0.0000  0.2136  0.4005  1.0
  Se  Se4  2  0.0000  0.0000  0.7112  1.0
  Se  Se5  2  0.5000  0.0000  0.1221  1.0
]