data_NaMg2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   5.19
_cell_angle_alpha   127.06
_cell_angle_beta   127.06
_cell_angle_gamma   78.16
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaMg2Ge
_chemical_formula_sum   'Na1 Mg2 Ge1'
_cell_volume   86.33
_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
  Na  Na3  1  0.0  0.0  0.0  1.0
  Mg  Mg1  1  0.0  0.31  0.02  1.0
  Mg  Mg2  1  0.31  0.0  0.02  1.0
  Ge  Ge0  1  0.0  0.0  0.03  1.0

data_NaMg2Ge
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.55
_cell_length_b   6.55
_cell_length_c   5.19
_cell_angle_alpha   90.0
_cell_angle_beta   129.08
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaMg2Ge
_chemical_formula_sum   'Na2 Mg4 Ge2'
_cell_volume   172.67
_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
  Na  Na0  2  0.0  0.0  0.0  1.0
  Mg  Mg1  4  0.34  0.34  0.7  1.0
  Ge  Ge2  2  0.0  0.0  0.03  1.0

Na Mg Mg Ge
NaMg2Ge is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaMg2Ge clusters. Na(1) is bonded in a single-bond geometry to two equivalent Mg(1) and one Ge(1) atom. Both Na(1)-Mg(1) bond lengths are 1.58 Å. The Na(1)-Ge(1) bond length is 0.16 Å. Mg(1) is bonded in a single-bond geometry to one Na(1) atom. Ge(1) is bonded in a single-bond geometry to one Na(1) atom.