data_[Sr2Tb2Al2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Tb  1.1000  1.7500  0.9815
  Al  1.6100  1.2500  0.6750
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.8253]
_cell_length_b [7.0184]
_cell_length_c [8.3680]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.9792]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [SrTbAlSe4]
_chemical_formula_sum '[Sr2 Tb2 Al2 Se8]'
_cell_volume [383.3730]
_cell_formula_units_Z [2]
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
[
  Sr  Sr0  2  0.2412  0.2500  0.0584  1.0
  Tb  Tb1  2  0.2247  0.2500  0.5550  1.0
  Al  Al2  2  0.2399  0.7500  0.3207  1.0
  Se  Se3  4  0.0044  0.5060  0.7308  1.0
  Se  Se4  2  0.4389  0.7500  0.1329  1.0
  Se  Se5  2  0.4487  0.7500  0.5994  1.0
]