data_[Rb8Mg4Be4As8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Mg  1.3100  1.5000  0.8600
  Be  1.5700  1.0500  0.5900
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Ibam]
_cell_length_a [6.2110]
_cell_length_b [16.7516]
_cell_length_c [6.2205]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [72]
_chemical_formula_structural [Rb2MgBeAs2]
_chemical_formula_sum '[Rb8 Mg4 Be4 As8]'
_cell_volume [647.2044]
_cell_formula_units_Z [4]
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  8  0.2454  0.8297  0.0000  1.0
  Mg  Mg1  4  0.0000  0.0000  0.2500  1.0
  Be  Be2  4  0.0000  0.5000  0.2500  1.0
  As  As3  8  0.2172  0.4202  0.5000  1.0
]