data_[Sr9Mg6Cd21]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Mg  1.3100  1.5000  0.8600
  Cd  1.6900  1.5500  1.0900
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [6.2234]
_cell_length_b [6.2234]
_cell_length_c [29.1190]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Sr3Mg2Cd7]
_chemical_formula_sum '[Sr9 Mg6 Cd21]'
_cell_volume [976.6918]
_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
[
  Sr  Sr0  6  0.0000  0.0000  0.1417  1
  Sr  Sr1  3  0.0000  0.0000  0.0000  1
  Mg  Mg2  6  0.0000  0.0000  0.3340  1
  Cd  Cd3  18  0.0053  0.5026  0.9176  1
  Cd  Cd4  3  -0.0000  -0.0000  0.5000  1
]