data_[K2Er2Mg2Te6]
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
  Mg  1.3100  1.5000  0.8600
  Te  2.1000  1.4000  1.2933
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [9.6124]
_cell_length_b [4.4902]
_cell_length_c [10.7038]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.0313]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KErMgTe3]
_chemical_formula_sum '[K2 Er2 Mg2 Te6]'
_cell_volume [439.2998]
_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  0.2086  0.7500  0.2332  1
  Er  Er1  2  0.3308  0.2500  0.8651  1
  Mg  Mg2  2  0.0844  0.7500  0.6092  1
  Te  Te3  2  0.1097  0.7500  0.8715  1
  Te  Te4  2  0.2212  0.2500  0.5406  1
  Te  Te5  2  0.4620  0.2500  0.1609  1
]