The material structure described by MgGd8Ni2Al crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one Mg(2), one Gd(1), one Gd(12), one Gd(14), one Gd(16), one Gd(2), one Gd(4), one Gd(5), one Gd(7), one Gd(9), one Al(1), and one Al(2) atom to form distorted MgGd9MgAl2 cuboctahedra that share  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra,  a faceface with one Al(1)Gd9Mg2Al cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. In the second Mg site, Mg(2) is bonded to one Mg(1), one Gd(1), one Gd(11), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(6), one Gd(7), one Gd(8), one Al(1), and one Al(2) atom to form distorted MgGd9MgAl2 cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Al(1)Gd9Mg2Al cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. There are sixteen inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(13), one Ni(2), one Ni(3), one Ni(4), and one Al(2) atom. In the second Gd site, Gd(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Gd(13), one Gd(14), one Gd(15), one Ni(1), one Ni(3), one Ni(4), and one Al(1) atom. In the third Gd site, Gd(3) is bonded in a 3-coordinate geometry to one Mg(2), one Gd(12), one Gd(14), one Gd(16), one Ni(1), one Ni(2), one Ni(4), one Al(1), and one Al(2) atom. In the fourth Gd site, Gd(4) is bonded in a 3-coordinate geometry to one Mg(1), one Gd(11), one Gd(15), one Gd(16), one Ni(1), one Ni(2), one Ni(3), one Al(1), and one Al(2) atom. In the fifth Gd site, Gd(5) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Ni(1), one Ni(4), and one Al(2) atom. In the sixth Gd site, Gd(6) is bonded in a distorted bent 150 degrees geometry to one Mg(2), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Ni(1), one Ni(3), and one Al(2) atom. In the seventh Gd site, Gd(7) is bonded in a bent 150 degrees geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Ni(1), and one Ni(2) atom. In the eighth Gd site, Gd(8) is bonded in a distorted bent 150 degrees geometry to one Mg(2), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Ni(2), one Ni(3), and one Al(1) atom. In the ninth Gd site, Gd(9) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Ni(2), one Ni(4), and one Al(1) atom. In the tenth Gd site, Gd(10) is bonded in a distorted bent 150 degrees geometry to one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Ni(3), one Ni(4), one Al(1), and one Al(2) atom. In the eleventh Gd site, Gd(11) is bonded in a 14-coordinate geometry to one Mg(2), one Gd(1), one Gd(10), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Gd(4), one Gd(6), one Gd(7), one Gd(9), one Ni(2), one Ni(3), and one Al(1) atom. In the twelfth Gd site, Gd(12) is bonded in a 14-coordinate geometry to one Mg(1), one Gd(1), one Gd(10), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Gd(3), one Gd(5), one Gd(7), one Gd(8), one Ni(2), one Ni(4), and one Al(1) atom. In the thirteenth Gd site, Gd(13) is bonded in a 14-coordinate geometry to one Gd(1), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Gd(2), one Gd(5), one Gd(6), one Gd(8), one Gd(9), one Ni(3), one Ni(4), one Al(1), and one Al(2) atom. In the fourteenth Gd site, Gd(14) is bonded in a 14-coordinate geometry to one Mg(1), one Gd(10), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(6), one Gd(7), one Gd(9), one Ni(1), one Ni(4), and one Al(2) atom. In the fifteenth Gd site, Gd(15) is bonded in a 14-coordinate geometry to one Mg(2), one Gd(10), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Gd(2), one Gd(4), one Gd(5), one Gd(7), one Gd(8), one Ni(1), one Ni(3), and one Al(2) atom. In the sixteenth Gd site, Gd(16) is bonded in a 14-coordinate geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Gd(3), one Gd(4), one Gd(5), one Gd(6), one Gd(8), one Gd(9), one Ni(1), and one Ni(2) atom. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 6-coordinate geometry to one Gd(14), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Gd(7) atom. In the second Ni site, Ni(2) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(11), one Gd(12), one Gd(16), one Gd(3), one Gd(4), one Gd(7), one Gd(8), and one Gd(9) atom. In the third Ni site, Ni(3) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(10), one Gd(11), one Gd(13), one Gd(15), one Gd(2), one Gd(4), one Gd(6), and one Gd(8) atom. In the fourth Ni site, Ni(4) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(10), one Gd(12), one Gd(13), one Gd(14), one Gd(2), one Gd(3), one Gd(5), and one Gd(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one Mg(1), one Mg(2), one Gd(10), one Gd(11), one Gd(12), one Gd(13), one Gd(2), one Gd(3), one Gd(4), one Gd(8), one Gd(9), and one Al(2) atom to form AlGd9Mg2Al cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. In the second Al site, Al(2) is bonded to one Mg(1), one Mg(2), one Gd(1), one Gd(10), one Gd(13), one Gd(14), one Gd(15), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Al(1) atom to form AlGd9Mg2Al cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra, and  a faceface with one Al(1)Gd9Mg2Al cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd8MgAlNi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.638
_cell_length_b   9.646
_cell_length_c   9.638
_cell_angle_alpha   89.977
_cell_angle_beta   59.586
_cell_angle_gamma   119.595
_symmetry_Int_Tables_number   1
_cell_volume   633.316
_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
  Gd  Gd0  1  0.693  0.348  0.957  1.0
  Gd  Gd1  1  0.306  0.348  0.346  1.0
  Gd  Gd2  1  0.302  0.955  0.347  1.0
  Gd  Gd3  1  0.698  0.351  0.348  1.0
  Gd  Gd4  1  0.380  0.190  0.811  1.0
  Gd  Gd5  1  0.999  0.810  0.810  1.0
  Gd  Gd6  1  0.002  0.187  0.813  1.0
  Gd  Gd7  1  0.620  0.809  0.188  1.0
  Gd  Gd8  1  0.001  0.190  0.190  1.0
  Gd  Gd9  1  0.001  0.807  0.193  1.0
  Gd  Gd10  1  0.129  0.564  0.940  1.0
  Gd  Gd11  1  0.496  0.931  0.940  1.0
  Gd  Gd12  1  0.500  0.565  0.937  1.0
  Gd  Gd13  1  0.869  0.931  0.566  1.0
  Gd  Gd14  1  0.503  0.564  0.566  1.0
  Gd  Gd15  1  0.499  0.934  0.565  1.0
  Mg  Mg16  1  0.846  0.272  0.574  1.0
  Mg  Mg17  1  0.154  0.581  0.573  1.0
  Al  Al18  1  0.155  0.581  0.263  1.0
  Al  Al19  1  0.846  0.582  0.572  1.0
  Ni  Ni20  1  0.284  0.141  0.573  1.0
  Ni  Ni21  1  0.716  0.143  0.142  1.0
  Ni  Ni22  1  0.718  0.575  0.141  1.0
  Ni  Ni23  1  0.283  0.142  0.142  1.0
[/CIF]
.
The material structure described by MgGd8Ni2Al crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one Mg(2), one Gd(1), one Gd(12), one Gd(14), one Gd(16), one Gd(2), one Gd(4), one Gd(5), one Gd(7), one Gd(9), one Al(1), and one Al(2) atom to form distorted MgGd9MgAl2 cuboctahedra that share  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra,  a faceface with one Al(1)Gd9Mg2Al cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. In the second Mg site, Mg(2) is bonded to one Mg(1), one Gd(1), one Gd(11), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(6), one Gd(7), one Gd(8), one Al(1), and one Al(2) atom to form distorted MgGd9MgAl2 cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Al(1)Gd9Mg2Al cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. There are sixteen inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(13), one Ni(2), one Ni(3), one Ni(4), and one Al(2) atom. In the second Gd site, Gd(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Gd(13), one Gd(14), one Gd(15), one Ni(1), one Ni(3), one Ni(4), and one Al(1) atom. In the third Gd site, Gd(3) is bonded in a 3-coordinate geometry to one Mg(2), one Gd(12), one Gd(14), one Gd(16), one Ni(1), one Ni(2), one Ni(4), one Al(1), and one Al(2) atom. In the fourth Gd site, Gd(4) is bonded in a 3-coordinate geometry to one Mg(1), one Gd(11), one Gd(15), one Gd(16), one Ni(1), one Ni(2), one Ni(3), one Al(1), and one Al(2) atom. In the fifth Gd site, Gd(5) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Ni(1), one Ni(4), and one Al(2) atom. In the sixth Gd site, Gd(6) is bonded in a distorted bent 150 degrees geometry to one Mg(2), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Ni(1), one Ni(3), and one Al(2) atom. In the seventh Gd site, Gd(7) is bonded in a bent 150 degrees geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Ni(1), and one Ni(2) atom. In the eighth Gd site, Gd(8) is bonded in a distorted bent 150 degrees geometry to one Mg(2), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Ni(2), one Ni(3), and one Al(1) atom. In the ninth Gd site, Gd(9) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Ni(2), one Ni(4), and one Al(1) atom. In the tenth Gd site, Gd(10) is bonded in a distorted bent 150 degrees geometry to one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Ni(3), one Ni(4), one Al(1), and one Al(2) atom. In the eleventh Gd site, Gd(11) is bonded in a 14-coordinate geometry to one Mg(2), one Gd(1), one Gd(10), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Gd(4), one Gd(6), one Gd(7), one Gd(9), one Ni(2), one Ni(3), and one Al(1) atom. In the twelfth Gd site, Gd(12) is bonded in a 14-coordinate geometry to one Mg(1), one Gd(1), one Gd(10), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Gd(3), one Gd(5), one Gd(7), one Gd(8), one Ni(2), one Ni(4), and one Al(1) atom. In the thirteenth Gd site, Gd(13) is bonded in a 14-coordinate geometry to one Gd(1), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Gd(2), one Gd(5), one Gd(6), one Gd(8), one Gd(9), one Ni(3), one Ni(4), one Al(1), and one Al(2) atom. In the fourteenth Gd site, Gd(14) is bonded in a 14-coordinate geometry to one Mg(1), one Gd(10), one Gd(12), one Gd(13), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(6), one Gd(7), one Gd(9), one Ni(1), one Ni(4), and one Al(2) atom. In the fifteenth Gd site, Gd(15) is bonded in a 14-coordinate geometry to one Mg(2), one Gd(10), one Gd(11), one Gd(13), one Gd(14), one Gd(16), one Gd(2), one Gd(4), one Gd(5), one Gd(7), one Gd(8), one Ni(1), one Ni(3), and one Al(2) atom. In the sixteenth Gd site, Gd(16) is bonded in a 14-coordinate geometry to one Mg(1), one Mg(2), one Gd(11), one Gd(12), one Gd(14), one Gd(15), one Gd(3), one Gd(4), one Gd(5), one Gd(6), one Gd(8), one Gd(9), one Ni(1), and one Ni(2) atom. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 6-coordinate geometry to one Gd(14), one Gd(15), one Gd(16), one Gd(2), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Gd(7) atom. In the second Ni site, Ni(2) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(11), one Gd(12), one Gd(16), one Gd(3), one Gd(4), one Gd(7), one Gd(8), and one Gd(9) atom. In the third Ni site, Ni(3) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(10), one Gd(11), one Gd(13), one Gd(15), one Gd(2), one Gd(4), one Gd(6), and one Gd(8) atom. In the fourth Ni site, Ni(4) is bonded in a 6-coordinate geometry to one Gd(1), one Gd(10), one Gd(12), one Gd(13), one Gd(14), one Gd(2), one Gd(3), one Gd(5), and one Gd(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one Mg(1), one Mg(2), one Gd(10), one Gd(11), one Gd(12), one Gd(13), one Gd(2), one Gd(3), one Gd(4), one Gd(8), one Gd(9), and one Al(2) atom to form AlGd9Mg2Al cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(2)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra, and  a faceface with one Al(2)Gd9Mg2Al cuboctahedra. In the second Al site, Al(2) is bonded to one Mg(1), one Mg(2), one Gd(1), one Gd(10), one Gd(13), one Gd(14), one Gd(15), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Al(1) atom to form AlGd9Mg2Al cuboctahedra that share  a cornercorner with one Mg(1)Gd9MgAl2 cuboctahedra,  a cornercorner with one Mg(2)Gd9MgAl2 cuboctahedra,  a cornercorner with one Al(1)Gd9Mg2Al cuboctahedra,  a faceface with one Mg(1)Gd9MgAl2 cuboctahedra,  a faceface with one Mg(2)Gd9MgAl2 cuboctahedra, and  a faceface with one Al(1)Gd9Mg2Al cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd8MgAlNi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.638
_cell_length_b   9.646
_cell_length_c   9.638
_cell_angle_alpha   89.977
_cell_angle_beta   59.586
_cell_angle_gamma   119.595
_symmetry_Int_Tables_number   1
_cell_volume   633.316
_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
  Gd  Gd0  1  0.693  0.348  0.957  1.0
  Gd  Gd1  1  0.306  0.348  0.346  1.0
  Gd  Gd2  1  0.302  0.955  0.347  1.0
  Gd  Gd3  1  0.698  0.351  0.348  1.0
  Gd  Gd4  1  0.380  0.190  0.811  1.0
  Gd  Gd5  1  0.999  0.810  0.810  1.0
  Gd  Gd6  1  0.002  0.187  0.813  1.0
  Gd  Gd7  1  0.620  0.809  0.188  1.0
  Gd  Gd8  1  0.001  0.190  0.190  1.0
  Gd  Gd9  1  0.001  0.807  0.193  1.0
  Gd  Gd10  1  0.129  0.564  0.940  1.0
  Gd  Gd11  1  0.496  0.931  0.940  1.0
  Gd  Gd12  1  0.500  0.565  0.937  1.0
  Gd  Gd13  1  0.869  0.931  0.566  1.0
  Gd  Gd14  1  0.503  0.564  0.566  1.0
  Gd  Gd15  1  0.499  0.934  0.565  1.0
  Mg  Mg16  1  0.846  0.272  0.574  1.0
  Mg  Mg17  1  0.154  0.581  0.573  1.0
  Al  Al18  1  0.155  0.581  0.263  1.0
  Al  Al19  1  0.846  0.582  0.572  1.0
  Ni  Ni20  1  0.284  0.141  0.573  1.0
  Ni  Ni21  1  0.716  0.143  0.142  1.0
  Ni  Ni22  1  0.718  0.575  0.141  1.0
  Ni  Ni23  1  0.283  0.142  0.142  1.0
[/CIF]
.