data_[Rb1Tb1Mg2Br8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tb  1.1000  1.7500  0.9815
  Mg  1.3100  1.5000  0.8600
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P-1]
_cell_length_a [6.9613]
_cell_length_b [6.9928]
_cell_length_c [9.6499]
_cell_angle_alpha [76.2257]
_cell_angle_beta [77.4350]
_cell_angle_gamma [76.1330]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [RbTbMg2Br8]
_chemical_formula_sum '[Rb1 Tb1 Mg2 Br8]'
_cell_volume [436.4764]
_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  0.5000  1
  Tb  Tb1  1  0.0000  0.0000  0.0000  1
  Mg  Mg2  2  0.4556  0.4483  0.7119  1
  Br  Br3  2  0.1852  0.7249  0.2255  1
  Br  Br4  2  0.2461  0.7877  0.7876  1
  Br  Br5  2  0.2820  0.2436  0.9546  1
  Br  Br6  2  0.3577  0.3117  0.5196  1
]