data_[Rb4Sr2Be4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sr  0.9500  2.0000  1.3200
  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 [16.0882]
_cell_length_b [4.0837]
_cell_length_c [8.4558]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.2109]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Sr(BeSe2)2]
_chemical_formula_sum '[Rb4 Sr2 Be4 Se8]'
_cell_volume [510.5797]
_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  0.1270  0.0000  0.5520  1.0
  Sr  Sr1  2  0.0000  0.0000  0.0000  1.0
  Be  Be2  4  0.1749  0.5000  0.9631  1.0
  Se  Se3  4  0.0355  0.5000  0.7679  1.0
  Se  Se4  4  0.2117  0.0000  0.1364  1.0
]