data_[La1Mg1H2Se1]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  La  1.1000  1.9500  1.1720
  Mg  1.3100  1.5000  0.8600
  H  2.2000  0.2500  0.0000
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P4/mmm]
_cell_length_a [4.0798]
_cell_length_b [4.0798]
_cell_length_c [7.3301]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [123]
_chemical_formula_structural [LaMgH2Se]
_chemical_formula_sum '[La1 Mg1 H2 Se1]'
_cell_volume [122.0082]
_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
[
  La  La0  1  0.0000  0.0000  0.5000  1
  Mg  Mg1  1  0.0000  0.0000  0.0000  1
  H  H2  2  0.0000  0.5000  0.0000  1
  Se  Se3  1  0.5000  0.5000  0.5000  1
]