data_[Rb16Mg8]
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
]
_symmetry_space_group_name_H-M [Fd-3m]
_cell_length_a [17.1630]
_cell_length_b [17.1630]
_cell_length_c [17.1630]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [227]
_chemical_formula_structural [Rb2Mg]
_chemical_formula_sum '[Rb16 Mg8]'
_cell_volume [5055.6909]
_cell_formula_units_Z [8]
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  16  0.1250  0.1250  0.1250  1
  Mg  Mg1  8  0.0000  0.0000  0.0000  1
]