The material structure described by Mg6SiSb crystallizes in the orthorhombic Amm2 space group. There are seven 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the second 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the third 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with ten Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four Mg(1,1); four Mg(2,2); and two equivalent Si(1) atoms to form distorted MgMg10Si2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with six equivalent Mg(3)Mg10Si2 cuboctahedra; corners with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; faces with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Sb(1)Mg10Si2 cuboctahedra. In the fifth Mg site, Mg(4) is bonded to two equivalent Mg(3); four Mg(1,1); four Mg(2,2); and two equivalent Sb(1) atoms to form distorted MgMg10Sb2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with six equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; edges with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; faces with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Si(1)Mg10Sb2 cuboctahedra. In the sixth 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the seventh 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with ten Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra. Si(1) is bonded to two equivalent Mg(3); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Sb(1) atoms to form SiMg10Sb2 cuboctahedra that share corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with six equivalent Si(1)Mg10Sb2 cuboctahedra; corners with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Mg(4)Mg10Sb2 cuboctahedra. Sb(1) is bonded to two equivalent Mg(4); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Si(1) atoms to form SbMg10Si2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with six equivalent Sb(1)Mg10Si2 cuboctahedra; corners with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Mg(3)Mg10Si2 cuboctahedra. is represented by the CIF file [CIF]
data_Mg6SiSb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   6.255
_cell_length_c   6.255
_cell_angle_alpha   119.404
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   175.654
_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
  Mg  Mg0  1  1.000  0.167  0.334  1.0
  Mg  Mg1  1  0.000  0.666  0.833  1.0
  Mg  Mg2  1  0.500  0.329  0.161  1.0
  Mg  Mg3  1  0.500  0.839  0.671  1.0
  Mg  Mg4  1  0.500  0.331  0.669  1.0
  Mg  Mg5  1  0.500  0.834  0.166  1.0
  Sb  Sb6  1  0.000  0.667  0.333  1.0
  Si  Si7  1  0.000  0.167  0.833  1.0
[/CIF]
.
The material structure described by Mg6SiSb crystallizes in the orthorhombic Amm2 space group. There are seven 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the second 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the third 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with ten Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four Mg(1,1); four Mg(2,2); and two equivalent Si(1) atoms to form distorted MgMg10Si2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with six equivalent Mg(3)Mg10Si2 cuboctahedra; corners with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; faces with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Sb(1)Mg10Si2 cuboctahedra. In the fifth Mg site, Mg(4) is bonded to two equivalent Mg(3); four Mg(1,1); four Mg(2,2); and two equivalent Sb(1) atoms to form distorted MgMg10Sb2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with six equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; edges with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; faces with four Mg(2,2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Si(1)Mg10Sb2 cuboctahedra. In the sixth 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with ten Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra. In the seventh 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 Si(1), and two equivalent Sb(1) atoms to form distorted MgMg8Si2Sb2 cuboctahedra that share corners with four equivalent Mg(4)Mg10Sb2 cuboctahedra; corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with ten Mg(2,2)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Mg(1)Mg8Si2Sb2 cuboctahedra; edges with four equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Sb(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra. Si(1) is bonded to two equivalent Mg(3); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Sb(1) atoms to form SiMg10Sb2 cuboctahedra that share corners with four equivalent Sb(1)Mg10Si2 cuboctahedra; corners with six equivalent Si(1)Mg10Sb2 cuboctahedra; corners with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Sb(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Mg(4)Mg10Sb2 cuboctahedra. Sb(1) is bonded to two equivalent Mg(4); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Si(1) atoms to form SbMg10Si2 cuboctahedra that share corners with four equivalent Si(1)Mg10Sb2 cuboctahedra; corners with six equivalent Sb(1)Mg10Si2 cuboctahedra; corners with eight Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with two equivalent Si(1)Mg10Sb2 cuboctahedra; edges with four equivalent Mg(4)Mg10Sb2 cuboctahedra; edges with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; edges with eight Mg(2,2)Mg8Si2Sb2 cuboctahedra; faces with two equivalent Mg(4)Mg10Sb2 cuboctahedra; faces with two equivalent Si(1)Mg10Sb2 cuboctahedra; faces with two equivalent Sb(1)Mg10Si2 cuboctahedra; faces with four Mg(1,1,1)Mg8Si2Sb2 cuboctahedra; faces with four equivalent Mg(2)Mg8Si2Sb2 cuboctahedra; and faces with six equivalent Mg(3)Mg10Si2 cuboctahedra. is represented by the CIF file [CIF]
data_Mg6SiSb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   6.255
_cell_length_c   6.255
_cell_angle_alpha   119.404
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   175.654
_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
  Mg  Mg0  1  1.000  0.167  0.334  1.0
  Mg  Mg1  1  0.000  0.666  0.833  1.0
  Mg  Mg2  1  0.500  0.329  0.161  1.0
  Mg  Mg3  1  0.500  0.839  0.671  1.0
  Mg  Mg4  1  0.500  0.331  0.669  1.0
  Mg  Mg5  1  0.500  0.834  0.166  1.0
  Sb  Sb6  1  0.000  0.667  0.333  1.0
  Si  Si7  1  0.000  0.167  0.833  1.0
[/CIF]
.