data_MnGeSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.95
_cell_length_b   2.95
_cell_length_c   8.03
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MnGeSe2
_chemical_formula_sum   'Mn1 Ge1 Se2'
_cell_volume   70.07
_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
  Mn  Mn1  1  0.0  0.0  0.0  1.0
  Ge  Ge0  1  0.0  0.0  0.01  1.0
  Se  Se2  1  0.48  0.48  0.48  1.0
  Se  Se3  1  0.48  0.48  0.55  1.0

data_MnGeSe2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.18
_cell_length_b   4.18
_cell_length_c   8.03
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MnGeSe2
_chemical_formula_sum   'Mn2 Ge2 Se4'
_cell_volume   140.14
_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
  Mn  Mn0  2  0.0  0.0  0.0  1.0
  Ge  Ge1  2  0.0  0.0  0.01  1.0
  Se  Se2  2  0.48  0.0  0.48  1.0
  Se  Se3  2  0.48  0.0  0.55  1.0

Mn Ge Se Se
Mn Ge Se Se 0 1 o o o 2 3 o o o 
MnGe(Se)2 is Cubic alpha N2-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two diselenium molecules and two manganese germanide molecules.