data_[Na8Al4H20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Al  1.6100  1.2500  0.6750
  H  2.2000  0.2500  0.0000
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.6537]
_cell_length_b [11.1081]
_cell_length_c [10.0829]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Na2AlH5]
_chemical_formula_sum '[Na8 Al4 H20]'
_cell_volume [409.2205]
_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
[
  Na  Na0  8  0.0000  0.1367  0.5708  1.0
  Al  Al1  4  0.0000  0.1580  0.2500  1.0
  H  H2  8  0.0000  0.0515  0.1276  1.0
  H  H3  8  0.0000  0.2713  0.1252  1.0
  H  H4  4  0.0000  0.3290  0.7500  1.0
]