The crystal structure described by Mg2Ga crystallizes in the monoclinic Cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(3), three equivalent Mg(4), one Ga(2), and two equivalent Ga(1) atoms to form distorted MgMg7Ga3 cuboctahedra that share corners with two equivalent Mg(4)Mg8Ga4 cuboctahedra, corners with four equivalent Mg(1)Mg7Ga3 cuboctahedra, corners with eight equivalent Mg(2)Mg7Ga5 cuboctahedra,  an edgeedge with one Mg(2)Mg7Ga5 cuboctahedra, faces with two equivalent Mg(1)Mg7Ga3 cuboctahedra, faces with three equivalent Mg(2)Mg7Ga5 cuboctahedra, and faces with five equivalent Mg(4)Mg8Ga4 cuboctahedra. In the second Mg site, Mg(2) is bonded to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Ga(2), and three equivalent Ga(1) atoms to form distorted MgMg7Ga5 cuboctahedra that share corners with six equivalent Mg(2)Mg7Ga5 cuboctahedra, corners with eight equivalent Mg(1)Mg7Ga3 cuboctahedra,  an edgeedge with one Mg(1)Mg7Ga3 cuboctahedra, edges with four equivalent Mg(4)Mg8Ga4 cuboctahedra, faces with two equivalent Mg(2)Mg7Ga5 cuboctahedra, faces with three equivalent Mg(1)Mg7Ga3 cuboctahedra, and faces with four equivalent Mg(4)Mg8Ga4 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), one Ga(1), and three equivalent Ga(2) atoms. In the fourth Mg site, Mg(4) is bonded to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), three equivalent Mg(1), two equivalent Ga(1), and two equivalent Ga(2) atoms to form distorted MgMg8Ga4 cuboctahedra that share corners with two equivalent Mg(1)Mg7Ga3 cuboctahedra, corners with six equivalent Mg(4)Mg8Ga4 cuboctahedra, edges with four equivalent Mg(2)Mg7Ga5 cuboctahedra, faces with two equivalent Mg(4)Mg8Ga4 cuboctahedra, faces with four equivalent Mg(2)Mg7Ga5 cuboctahedra, and faces with five equivalent Mg(1)Mg7Ga3 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(4), and three equivalent Mg(2) atoms. In the second Ga site, Ga(2) is bonded in a 8-coordinate geometry to one Mg(1), two equivalent Mg(2), two equivalent Mg(4), and three equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_Mg2Ga
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.921
_cell_length_b   5.921
_cell_length_c   7.206
_cell_angle_alpha   78.577
_cell_angle_beta   78.577
_cell_angle_gamma   30.304
_symmetry_Int_Tables_number   1
_cell_volume   124.748
_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  0.005  0.005  0.004  1.0
  Mg  Mg1  1  0.337  0.337  0.340  1.0
  Mg  Mg2  1  0.659  0.659  0.655  1.0
  Mg  Mg3  1  0.280  0.280  0.941  1.0
  Ga  Ga4  1  0.616  0.616  0.276  1.0
  Ga  Ga5  1  0.937  0.937  0.618  1.0
[/CIF]
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The crystal structure described by Mg2Ga crystallizes in the monoclinic Cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(3), three equivalent Mg(4), one Ga(2), and two equivalent Ga(1) atoms to form distorted MgMg7Ga3 cuboctahedra that share corners with two equivalent Mg(4)Mg8Ga4 cuboctahedra, corners with four equivalent Mg(1)Mg7Ga3 cuboctahedra, corners with eight equivalent Mg(2)Mg7Ga5 cuboctahedra,  an edgeedge with one Mg(2)Mg7Ga5 cuboctahedra, faces with two equivalent Mg(1)Mg7Ga3 cuboctahedra, faces with three equivalent Mg(2)Mg7Ga5 cuboctahedra, and faces with five equivalent Mg(4)Mg8Ga4 cuboctahedra. In the second Mg site, Mg(2) is bonded to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Ga(2), and three equivalent Ga(1) atoms to form distorted MgMg7Ga5 cuboctahedra that share corners with six equivalent Mg(2)Mg7Ga5 cuboctahedra, corners with eight equivalent Mg(1)Mg7Ga3 cuboctahedra,  an edgeedge with one Mg(1)Mg7Ga3 cuboctahedra, edges with four equivalent Mg(4)Mg8Ga4 cuboctahedra, faces with two equivalent Mg(2)Mg7Ga5 cuboctahedra, faces with three equivalent Mg(1)Mg7Ga3 cuboctahedra, and faces with four equivalent Mg(4)Mg8Ga4 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), one Ga(1), and three equivalent Ga(2) atoms. In the fourth Mg site, Mg(4) is bonded to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), three equivalent Mg(1), two equivalent Ga(1), and two equivalent Ga(2) atoms to form distorted MgMg8Ga4 cuboctahedra that share corners with two equivalent Mg(1)Mg7Ga3 cuboctahedra, corners with six equivalent Mg(4)Mg8Ga4 cuboctahedra, edges with four equivalent Mg(2)Mg7Ga5 cuboctahedra, faces with two equivalent Mg(4)Mg8Ga4 cuboctahedra, faces with four equivalent Mg(2)Mg7Ga5 cuboctahedra, and faces with five equivalent Mg(1)Mg7Ga3 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(4), and three equivalent Mg(2) atoms. In the second Ga site, Ga(2) is bonded in a 8-coordinate geometry to one Mg(1), two equivalent Mg(2), two equivalent Mg(4), and three equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_Mg2Ga
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.921
_cell_length_b   5.921
_cell_length_c   7.206
_cell_angle_alpha   78.577
_cell_angle_beta   78.577
_cell_angle_gamma   30.304
_symmetry_Int_Tables_number   1
_cell_volume   124.748
_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  0.005  0.005  0.004  1.0
  Mg  Mg1  1  0.337  0.337  0.340  1.0
  Mg  Mg2  1  0.659  0.659  0.655  1.0
  Mg  Mg3  1  0.280  0.280  0.941  1.0
  Ga  Ga4  1  0.616  0.616  0.276  1.0
  Ga  Ga5  1  0.937  0.937  0.618  1.0
[/CIF]
.