The material structure described by Mg is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the third Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine Mg(2,2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. is represented by the CIF file [CIF]
data_Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.185
_cell_length_b   3.185
_cell_length_c   7.916
_cell_angle_alpha   78.394
_cell_angle_beta   78.394
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   67.661
_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  1  0.000  0.000  0.000  1.0
  Mg  Mg1  1  0.222  0.222  0.334  1.0
  Mg  Mg2  1  0.778  0.778  0.666  1.0
[/CIF]
.
The material structure described by Mg is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the third Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine Mg(2,2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. is represented by the CIF file [CIF]
data_Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.185
_cell_length_b   3.185
_cell_length_c   7.916
_cell_angle_alpha   78.394
_cell_angle_beta   78.394
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   67.661
_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  1  0.000  0.000  0.000  1.0
  Mg  Mg1  1  0.222  0.222  0.334  1.0
  Mg  Mg2  1  0.778  0.778  0.666  1.0
[/CIF]
.