data_MnBeCr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.73
_cell_length_b   3.73
_cell_length_c   3.01
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MnBeCr2
_chemical_formula_sum   'Mn1 Be1 Cr2'
_cell_volume   42.05
_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  Mn3  1  0.87  0.87  0.0  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Cr  Cr1  1  0.0  0.87  0.51  1.0
  Cr  Cr2  1  0.87  0.0  0.51  1.0

data_MnBeCr2
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   3.01
_cell_length_b   5.28
_cell_length_c   5.28
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   MnBeCr2
_chemical_formula_sum   'Mn2 Be2 Cr4'
_cell_volume   84.1
_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, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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  0.87  1.0
  Be  Be1  2  0.0  0.0  0.0  1.0
  Cr  Cr2  4  0.5  0.07  0.93  1.0

Mn Be Cr Cr
BeMn(Cr)2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BeMn clusters and two Cr clusters. In each BeMn cluster, Be(1) is bonded in a single-bond geometry to one Mn(1) atom. The Be(1)-Mn(1) bond length is 0.70 Å. Mn(1) is bonded in a single-bond geometry to one Be(1) atom. In each Cr cluster, Cr(1) is bonded in a single-bond geometry to one Cr(1) atom. The Cr(1)-Cr(1) bond length is 0.70 Å.