data_Ca2MnGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.63
_cell_length_b   9.63
_cell_length_c   9.63
_cell_angle_alpha   19.82
_cell_angle_beta   19.82
_cell_angle_gamma   19.82
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2MnGe
_chemical_formula_sum   'Ca2 Mn1 Ge1'
_cell_volume   89.85
_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
  Ca  Ca0  1  0.0  0.0  0.18  1.0
  Ca  Ca1  1  0.0  0.0  0.14  1.0
  Mn  Mn3  1  0.0  0.0  0.0  1.0
  Ge  Ge2  1  0.0  0.0  0.16  1.0

data_Ca2MnGe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.74
_cell_length_b   3.32
_cell_length_c   9.63
_cell_angle_alpha   90.0
_cell_angle_beta   101.46
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ca2MnGe
_chemical_formula_sum   'Ca4 Mn2 Ge2'
_cell_volume   179.69
_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
  Ca  Ca0  2  0.0  0.0  0.82  1.0
  Ca  Ca1  2  0.0  0.0  0.86  1.0
  Mn  Mn2  2  0.0  0.0  0.0  1.0
  Ge  Ge3  2  0.0  0.0  0.84  1.0

Ca Ca Mn Ge
Ca Ca Mn Ge 0 3 o o o 0 2 o o o 1 3 o o o 1 2 o o o 2 3 o o o 
Ca2MnGe is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ca2MnGe clusters. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a single-bond geometry to one Ge(1) atom. The Ca(1)-Ge(1) bond length is 0.17 Å. In the second Ca site, Ca(2) is bonded in a distorted single-bond geometry to one Mn(1) and one Ge(1) atom. The Ca(2)-Mn(1) bond length is 1.38 Å. The Ca(2)-Ge(1) bond length is 0.17 Å. Mn(1) is bonded in a single-bond geometry to one Ca(2) atom. Ge(1) is bonded in a linear geometry to one Ca(1) and one Ca(2) atom.