data_[Mg3Mn6Sn3O18]
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
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2397]
_cell_length_b [5.2397]
_cell_length_c [14.2377]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [MgMn2SnO6]
_chemical_formula_sum '[Mg3 Mn6 Sn3 O18]'
_cell_volume [338.5179]
_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  0.1926  1
  Mn  Mn1  3  0.0000  0.0000  0.4777  1
  Mn  Mn2  3  0.0000  0.0000  0.9883  1
  Sn  Sn3  3  0.0000  0.0000  0.6832  1
  O  O4  9  0.0090  0.6398  0.2525  1
  O  O5  9  0.0444  0.3742  0.7462  1
]