data_[Be4Hg2Cl2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Be  1.5700  1.0500  0.5900
  Hg  2.0000  1.5000  1.2450
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [2.8470]
_cell_length_b [6.4438]
_cell_length_c [8.8834]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [Be2HgCl]
_chemical_formula_sum '[Be4 Hg2 Cl2]'
_cell_volume [162.9707]
_cell_formula_units_Z [2]
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
[
  Be  Be0  2  0.0000  0.0000  0.9549  1
  Be  Be1  2  0.0000  0.5000  0.2526  1
  Hg  Hg2  2  0.0000  0.5000  0.7000  1
  Cl  Cl3  2  0.0000  0.0000  0.5925  1
]