data_[Na6Sr4Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.1111]
_cell_length_b [4.6713]
_cell_length_c [8.6116]
_cell_angle_alpha [90.0000]
_cell_angle_beta [94.7829]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3(SrHg)2]
_chemical_formula_sum '[Na6 Sr4 Hg4]'
_cell_volume [485.5069]
_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
[
  Na  Na0  4  0.1862  0.5000  0.8663  1
  Na  Na1  2  0.0000  0.0000  0.0000  1
  Sr  Sr2  4  0.1258  0.5000  0.3648  1
  Hg  Hg3  4  0.0908  0.0000  0.6522  1
]