data_[Rb4Be2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Be  1.5700  1.0500  0.5900
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.8869]
_cell_length_b [5.9486]
_cell_length_c [8.0058]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.5821]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [Rb2BeF4]
_chemical_formula_sum '[Rb4 Be2 F8]'
_cell_volume [270.0477]
_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  2  0.2057  0.2500  0.4424  1.0
  Rb  Rb1  2  0.2938  0.2500  0.9739  1.0
  Be  Be2  2  0.2930  0.7500  0.2226  1.0
  F  F3  4  0.4542  0.5368  0.2710  1.0
  F  F4  2  0.0980  0.7500  0.3239  1.0
  F  F5  2  0.1817  0.7500  0.0203  1.0
]