data_[Ca4Mg2Hg2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Mg  1.3100  1.5000  0.8600
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [16.9618]
_cell_length_b [4.2051]
_cell_length_c [3.8426]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.4981]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ca2MgHg]
_chemical_formula_sum '[Ca4 Mg2 Hg2]'
_cell_volume [268.5813]
_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
[
  Ca  Ca0  4  0.1650  0.5000  0.1686  1
  Mg  Mg1  2  0.0000  0.0000  0.0000  1
  Hg  Hg2  2  0.0000  0.5000  0.5000  1
]