data_[Mg3Mn6Al6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Mn  1.5500  1.4000  0.6483
  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 [5.1259]
_cell_length_b [5.1259]
_cell_length_c [14.8045]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [MgMn2Al2O6]
_chemical_formula_sum '[Mg3 Mn6 Al6 O18]'
_cell_volume [336.8709]
_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
[
  Mg  Mg0  3  0.0000  0.0000  0.0000  1.0
  Mn  Mn1  6  0.0000  0.0000  0.3767  1.0
  Al  Al2  6  0.0000  0.0000  0.1759  1.0
  O  O3  18  0.0036  0.3870  0.5765  1.0
]