data_[Ca4Sn12Hg8]
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/c]
_cell_length_a [7.5560]
_cell_length_b [9.8718]
_cell_length_c [8.7851]
_cell_angle_alpha [90.0000]
_cell_angle_beta [93.2359]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [CaSn3Hg2]
_chemical_formula_sum '[Ca4 Sn12 Hg8]'
_cell_volume [654.2459]
_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  0.0000  0.3603  0.2500  1
  Sn  Sn1  8  0.2368  0.1050  0.0474  1
  Sn  Sn2  4  0.0000  0.0555  0.7500  1
  Hg  Hg3  8  0.1513  0.3313  0.6114  1
]