data_[K2Er2Hg2Se6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Er  1.2400  1.7500  1.0300
  Hg  2.0000  1.5000  1.2450
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [8.8448]
_cell_length_b [4.2402]
_cell_length_c [10.2261]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.3758]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KErHgSe3]
_chemical_formula_sum '[K2 Er2 Hg2 Se6]'
_cell_volume [366.0195]
_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
[
  K  K0  2  0.2159  0.2500  0.2397  1.0
  Er  Er1  2  0.3300  0.7500  0.8635  1.0
  Hg  Hg2  2  0.0907  0.2500  0.6117  1.0
  Se  Se3  2  0.1059  0.2500  0.8720  1.0
  Se  Se4  2  0.2467  0.7500  0.5476  1.0
  Se  Se5  2  0.4587  0.7500  0.1486  1.0
]