data_MgGaGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.78
_cell_length_b   4.78
_cell_length_c   3.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgGaGe2
_chemical_formula_sum   'Mg1 Ga1 Ge2'
_cell_volume   77.37
_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  Mg3  1  0.0  0.0  0.0  1.0
  Ga  Ga0  1  0.39  0.39  0.0  1.0
  Ge  Ge1  1  0.39  0.0  0.69  1.0
  Ge  Ge2  1  0.0  0.39  0.69  1.0

data_MgGaGe2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.76
_cell_length_b   6.76
_cell_length_c   3.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgGaGe2
_chemical_formula_sum   'Mg2 Ga2 Ge4'
_cell_volume   154.74
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.0  1.0
  Ga  Ga1  2  0.39  0.0  0.0  1.0
  Ge  Ge2  4  0.2  0.2  0.69  1.0

Mg Ga Ge Ge
MgGaGe2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two MgGaGe2 clusters. Mg(1) is bonded in a 2-coordinate geometry to two equivalent Ge(1) atoms. Both Mg(1)-Ge(1) bond lengths are 2.14 Å. Ga(1) is bonded in a 2-coordinate geometry to two equivalent Ge(1) atoms. Both Ga(1)-Ge(1) bond lengths are 2.14 Å. Ge(1) is bonded in a 2-coordinate geometry to one Mg(1) and one Ga(1) atom.