The structure described by Mg2Zn crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(2) and four equivalent Zn(1) atoms to form distorted MgMg6Zn4 cuboctahedra that share corners with four equivalent Mg(1)Mg6Zn4 cuboctahedra, corners with twelve equivalent Mg(2)Mg10Zn2 cuboctahedra,  an edgeedge with one Mg(2)Mg10Zn2 cuboctahedra, edges with eight equivalent Mg(1)Mg6Zn4 cuboctahedra, faces with six equivalent Mg(2)Mg10Zn2 cuboctahedra, and faces with six equivalent Mg(1)Mg6Zn4 cuboctahedra. In the second Mg site, Mg(2) is bonded to four equivalent Mg(2), six equivalent Mg(1), and two equivalent Zn(1) atoms to form distorted MgMg10Zn2 cuboctahedra that share corners with six equivalent Mg(2)Mg10Zn2 cuboctahedra, corners with twelve equivalent Mg(1)Mg6Zn4 cuboctahedra,  an edgeedge with one Mg(1)Mg6Zn4 cuboctahedra, faces with six equivalent Mg(1)Mg6Zn4 cuboctahedra, and faces with ten equivalent Mg(2)Mg10Zn2 cuboctahedra. Zn(1) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Zn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.920
_cell_length_b   7.920
_cell_length_c   4.955
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   157.386
_symmetry_Int_Tables_number   1
_cell_volume   119.526
_cell_formula_units_Z   2
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  0.622  0.378  0.250  1.0
  Mg  Mg1  1  0.940  0.060  0.250  1.0
  Mg  Mg2  1  0.060  0.940  0.750  1.0
  Mg  Mg3  1  0.378  0.622  0.750  1.0
  Zn  Zn4  1  0.278  0.722  0.250  1.0
  Zn  Zn5  1  0.722  0.278  0.750  1.0
[/CIF]
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The structure described by Mg2Zn crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(2) and four equivalent Zn(1) atoms to form distorted MgMg6Zn4 cuboctahedra that share corners with four equivalent Mg(1)Mg6Zn4 cuboctahedra, corners with twelve equivalent Mg(2)Mg10Zn2 cuboctahedra,  an edgeedge with one Mg(2)Mg10Zn2 cuboctahedra, edges with eight equivalent Mg(1)Mg6Zn4 cuboctahedra, faces with six equivalent Mg(2)Mg10Zn2 cuboctahedra, and faces with six equivalent Mg(1)Mg6Zn4 cuboctahedra. In the second Mg site, Mg(2) is bonded to four equivalent Mg(2), six equivalent Mg(1), and two equivalent Zn(1) atoms to form distorted MgMg10Zn2 cuboctahedra that share corners with six equivalent Mg(2)Mg10Zn2 cuboctahedra, corners with twelve equivalent Mg(1)Mg6Zn4 cuboctahedra,  an edgeedge with one Mg(1)Mg6Zn4 cuboctahedra, faces with six equivalent Mg(1)Mg6Zn4 cuboctahedra, and faces with ten equivalent Mg(2)Mg10Zn2 cuboctahedra. Zn(1) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Zn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.920
_cell_length_b   7.920
_cell_length_c   4.955
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   157.386
_symmetry_Int_Tables_number   1
_cell_volume   119.526
_cell_formula_units_Z   2
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  0.622  0.378  0.250  1.0
  Mg  Mg1  1  0.940  0.060  0.250  1.0
  Mg  Mg2  1  0.060  0.940  0.750  1.0
  Mg  Mg3  1  0.378  0.622  0.750  1.0
  Zn  Zn4  1  0.278  0.722  0.250  1.0
  Zn  Zn5  1  0.722  0.278  0.750  1.0
[/CIF]
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