data_[K4Y2Be4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Y  1.2200  1.8000  1.0400
  Be  1.5700  1.0500  0.5900
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.3144]
_cell_length_b [3.8513]
_cell_length_c [8.0782]
_cell_angle_alpha [90.0000]
_cell_angle_beta [111.2834]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K2Y(BeSe2)2]
_chemical_formula_sum '[K4 Y2 Be4 Se8]'
_cell_volume [443.9644]
_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  4  0.1282  0.0000  0.5450  1
  Y  Y1  2  0.0000  0.0000  0.0000  1
  Be  Be2  4  0.1679  0.5000  0.9840  1
  Se  Se3  4  0.0323  0.5000  0.7609  1
  Se  Se4  4  0.2060  0.0000  0.1518  1
]