data_CrFeSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.83
_cell_length_b   3.91
_cell_length_c   4.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrFeSi2
_chemical_formula_sum   'Cr1 Fe1 Si2'
_cell_volume   44.37
_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
  Cr  Cr0  1  0.41  0.0  0.01  1.0
  Fe  Fe1  1  0.41  0.95  0.0  1.0
  Si  Si2  1  0.0  0.95  0.01  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0

data_CrFeSi2
_symmetry_space_group_name_H-M   Pm
_cell_length_a   2.83
_cell_length_b   4.02
_cell_length_c   3.91
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   CrFeSi2
_chemical_formula_sum   'Cr1 Fe1 Si2'
_cell_volume   44.37
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '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
  Cr  Cr0  1  0.41  0.5  0.0  1.0
  Fe  Fe1  1  0.41  0.5  0.95  1.0
  Si  Si2  1  -0.0  0.5  0.95  1.0
  Si  Si3  1  0.0  0.5  0.0  1.0

Cr Fe Si Si
FeSi(CrSi) is beta oxygen-derived structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one chromium--iron (1/1) molecule and one silicon molecule.