data_[Ca8Sn4Hg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Sn  1.9600  1.4500  0.8300
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.7424]
_cell_length_b [4.6408]
_cell_length_c [11.5048]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.9080]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ca2SnHg2]
_chemical_formula_sum '[Ca8 Sn4 Hg8]'
_cell_volume [568.6226]
_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
[
  Ca  Ca0  4  0.0080  0.0000  0.3357  1.0
  Ca  Ca1  4  0.1848  0.0000  0.1030  1.0
  Sn  Sn2  4  0.2115  0.5000  0.3210  1.0
  Hg  Hg3  4  0.0437  0.5000  0.8913  1.0
  Hg  Hg4  4  0.1384  0.5000  0.5539  1.0
]