data_Li2MnBe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.29
_cell_length_b   2.29
_cell_length_c   8.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2MnBe
_chemical_formula_sum   'Li2 Mn1 Be1'
_cell_volume   44.64
_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
  Li  Li1  1  0.14  0.14  0.08  1.0
  Li  Li2  1  0.14  0.14  0.47  1.0
  Mn  Mn3  1  0.0  0.0  0.27  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0

data_Li2MnBe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.23
_cell_length_b   3.23
_cell_length_c   8.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Li2MnBe
_chemical_formula_sum   'Li4 Mn2 Be2'
_cell_volume   89.28
_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
  Li  Li0  2  0.14  0.0  0.08  1.0
  Li  Li1  2  0.14  0.0  0.47  1.0
  Mn  Mn2  2  0.0  0.0  0.27  1.0
  Be  Be3  2  0.0  0.0  0.0  1.0

Li Li Mn Be
Li Li Mn Be 0 3 o o o 0 2 o o o 1 2 o o o 
Li2BeMn crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Li2BeMn clusters. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted single-bond geometry to one Be(1) and one Mn(1) atom. The Li(1)-Be(1) bond length is 0.79 Å. The Li(1)-Mn(1) bond length is 1.75 Å. In the second Li site, Li(2) is bonded in a single-bond geometry to one Mn(1) atom. The Li(2)-Mn(1) bond length is 1.75 Å. Be(1) is bonded in a single-bond geometry to one Li(1) atom. Mn(1) is bonded in a bent 150 degrees geometry to one Li(1) and one Li(2) atom.