data_[Pr6Mg3Al3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pr  1.1300  1.8500  1.0600
  Mg  1.3100  1.5000  0.8600
  Al  1.6100  1.2500  0.6750
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.5630]
_cell_length_b [5.5630]
_cell_length_c [13.0903]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Pr2MgAlO6]
_chemical_formula_sum '[Pr6 Mg3 Al3 O18]'
_cell_volume [350.8317]
_cell_formula_units_Z [3]
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
[
  Pr  Pr0  6  0.0000  0.0000  0.2486  1.0
  Mg  Mg1  3  -0.0000  0.0000  0.5000  1.0
  Al  Al2  3  0.0000  0.0000  0.0000  1.0
  O  O3  18  0.0145  0.4376  0.7479  1.0
]