data_[Na2Al2H4]
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 [P2_1/m]
_cell_length_a [4.9058]
_cell_length_b [4.5453]
_cell_length_c [6.2286]
_cell_angle_alpha [90.0000]
_cell_angle_beta [111.9509]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaAlH2]
_chemical_formula_sum '[Na2 Al2 H4]'
_cell_volume [128.8180]
_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
[
  Na  Na0  2  0.1192  0.2500  0.2673  1.0
  Al  Al1  2  0.4859  0.2500  0.8895  1.0
  H  H2  2  0.2070  0.2500  0.6370  1.0
  H  H3  2  0.2170  0.7500  0.1861  1.0
]