data_[K1Rb1Be2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  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 [P-3]
_cell_length_a [5.3672]
_cell_length_b [5.3672]
_cell_length_c [8.9220]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [147]
_chemical_formula_structural [KRbBe2F8]
_chemical_formula_sum '[K1 Rb1 Be2 F8]'
_cell_volume [222.5783]
_cell_formula_units_Z [1]
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  1  0.0000  0.0000  0.0000  1
  K  K1  1  0.0000  0.0000  0.5000  1
  Be  Be2  2  0.3333  0.6667  0.7731  1
  F  F3  6  0.0858  0.3764  0.7149  1
  F  F4  2  0.3333  0.6667  0.9476  1
]