data_[Rb4Ag2Hg4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Ag  1.9300  1.6000  1.0867
  Hg  2.0000  1.5000  1.2450
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [18.3200]
_cell_length_b [4.2221]
_cell_length_c [7.5595]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.5529]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Ag(HgSe2)2]
_chemical_formula_sum '[Rb4 Ag2 Hg4 Se8]'
_cell_volume [557.4921]
_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
[
  Rb  Rb0  4  0.1238  0.0000  0.5354  1.0
  Ag  Ag1  2  0.0000  0.0000  0.0000  1.0
  Hg  Hg2  4  0.1659  0.5000  0.0070  1.0
  Se  Se3  4  0.0204  0.5000  0.7907  1.0
  Se  Se4  4  0.2279  0.0000  0.2187  1.0
]