The compound described by Mg6LaZr crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent La(1), and two equivalent Zr(1) atoms to form MgLa2Mg8Zr2 cuboctahedra that share corners with four equivalent La(1)Mg10Zr2 cuboctahedra, corners with four equivalent Zr(1)La2Mg10 cuboctahedra, corners with ten equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent La(1)Mg10Zr2 cuboctahedra, edges with two equivalent Zr(1)La2Mg10 cuboctahedra, edges with four equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, and faces with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent La(1), and two equivalent Zr(1) atoms to form distorted MgLa2Mg8Zr2 cuboctahedra that share corners with four equivalent Mg(4)La2Mg10 cuboctahedra, corners with four equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with ten equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(4)La2Mg10 cuboctahedra, edges with two equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with four equivalent La(1)Mg10Zr2 cuboctahedra, edges with four equivalent Zr(1)La2Mg10 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Zr(1) atoms to form MgMg10Zr2 cuboctahedra that share corners with four equivalent Mg(4)La2Mg10 cuboctahedra, corners with six equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent Zr(1)La2Mg10 cuboctahedra, edges with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent La(1)Mg10Zr2 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form distorted MgLa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with six equivalent Mg(4)La2Mg10 cuboctahedra, corners with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent La(1)Mg10Zr2 cuboctahedra, edges with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Zr(1)La2Mg10 cuboctahedra. La(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Zr(1) atoms to form LaMg10Zr2 cuboctahedra that share corners with four equivalent Zr(1)La2Mg10 cuboctahedra, corners with six equivalent La(1)Mg10Zr2 cuboctahedra, corners with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent Zr(1)La2Mg10 cuboctahedra, edges with four equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Mg(3)Mg10Zr2 cuboctahedra. Zr(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form ZrLa2Mg10 cuboctahedra that share corners with four equivalent La(1)Mg10Zr2 cuboctahedra, corners with six equivalent Zr(1)La2Mg10 cuboctahedra, corners with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent La(1)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with four equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Mg(4)La2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_LaMg6Zr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.265
_cell_length_b   6.504
_cell_length_c   6.696
_cell_angle_alpha   119.053
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.431
_cell_formula_units_Z   1
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
  La  La0  1  0.500  0.667  0.334  1.0
  Mg  Mg1  1  0.500  0.668  0.835  1.0
  Mg  Mg2  1  0.500  0.167  0.835  1.0
  Mg  Mg3  1  0.000  0.844  0.165  1.0
  Mg  Mg4  1  0.000  0.321  0.165  1.0
  Mg  Mg5  1  0.000  0.330  0.660  1.0
  Mg  Mg6  1  0.000  0.840  0.680  1.0
  Zr  Zr7  1  0.500  0.162  0.325  1.0
[/CIF]
.
The compound described by Mg6LaZr crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent La(1), and two equivalent Zr(1) atoms to form MgLa2Mg8Zr2 cuboctahedra that share corners with four equivalent La(1)Mg10Zr2 cuboctahedra, corners with four equivalent Zr(1)La2Mg10 cuboctahedra, corners with ten equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent La(1)Mg10Zr2 cuboctahedra, edges with two equivalent Zr(1)La2Mg10 cuboctahedra, edges with four equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, and faces with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent La(1), and two equivalent Zr(1) atoms to form distorted MgLa2Mg8Zr2 cuboctahedra that share corners with four equivalent Mg(4)La2Mg10 cuboctahedra, corners with four equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with ten equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(4)La2Mg10 cuboctahedra, edges with two equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with four equivalent La(1)Mg10Zr2 cuboctahedra, edges with four equivalent Zr(1)La2Mg10 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Zr(1) atoms to form MgMg10Zr2 cuboctahedra that share corners with four equivalent Mg(4)La2Mg10 cuboctahedra, corners with six equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent Zr(1)La2Mg10 cuboctahedra, edges with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent La(1)Mg10Zr2 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form distorted MgLa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Mg10Zr2 cuboctahedra, corners with six equivalent Mg(4)La2Mg10 cuboctahedra, corners with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with two equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, edges with four equivalent La(1)Mg10Zr2 cuboctahedra, edges with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Zr(1)La2Mg10 cuboctahedra. La(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Zr(1) atoms to form LaMg10Zr2 cuboctahedra that share corners with four equivalent Zr(1)La2Mg10 cuboctahedra, corners with six equivalent La(1)Mg10Zr2 cuboctahedra, corners with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent Zr(1)La2Mg10 cuboctahedra, edges with four equivalent Mg(4)La2Mg10 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(4)La2Mg10 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Mg(3)Mg10Zr2 cuboctahedra. Zr(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form ZrLa2Mg10 cuboctahedra that share corners with four equivalent La(1)Mg10Zr2 cuboctahedra, corners with six equivalent Zr(1)La2Mg10 cuboctahedra, corners with eight equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with two equivalent La(1)Mg10Zr2 cuboctahedra, edges with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, edges with four equivalent Mg(3)Mg10Zr2 cuboctahedra, edges with eight equivalent Mg(2)La2Mg8Zr2 cuboctahedra, faces with two equivalent Mg(3)Mg10Zr2 cuboctahedra, faces with two equivalent La(1)Mg10Zr2 cuboctahedra, faces with two equivalent Zr(1)La2Mg10 cuboctahedra, faces with four equivalent Mg(1)La2Mg8Zr2 cuboctahedra, faces with four equivalent Mg(2)La2Mg8Zr2 cuboctahedra, and faces with six equivalent Mg(4)La2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_LaMg6Zr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.265
_cell_length_b   6.504
_cell_length_c   6.696
_cell_angle_alpha   119.053
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.431
_cell_formula_units_Z   1
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
  La  La0  1  0.500  0.667  0.334  1.0
  Mg  Mg1  1  0.500  0.668  0.835  1.0
  Mg  Mg2  1  0.500  0.167  0.835  1.0
  Mg  Mg3  1  0.000  0.844  0.165  1.0
  Mg  Mg4  1  0.000  0.321  0.165  1.0
  Mg  Mg5  1  0.000  0.330  0.660  1.0
  Mg  Mg6  1  0.000  0.840  0.680  1.0
  Zr  Zr7  1  0.500  0.162  0.325  1.0
[/CIF]
.