data_[Rb16Mg8Cr8Se32]
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
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Fddd]
_cell_length_a [6.1079]
_cell_length_b [14.1657]
_cell_length_c [25.0504]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [70]
_chemical_formula_structural [Rb2MgCrSe4]
_chemical_formula_sum '[Rb16 Mg8 Cr8 Se32]'
_cell_volume [2167.4500]
_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  0.0000  0.0000  0.1799  1.0
  Mg  Mg1  8  0.0000  0.0000  0.0000  1.0
  Cr  Cr2  8  0.0000  0.0000  0.5000  1.0
  Se  Se3  32  0.0291  0.1528  0.6969  1.0
]