data_LaCoSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.19
_cell_length_b   3.19
_cell_length_c   6.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaCoSi2
_chemical_formula_sum   'La1 Co1 Si2'
_cell_volume   68.96
_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
  La  La1  1  0.59  0.59  0.08  1.0
  Co  Co0  1  0.0  0.0  0.74  1.0
  Si  Si2  1  0.0  0.0  0.47  1.0
  Si  Si3  1  0.59  0.59  0.9  1.0

data_LaCoSi2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.51
_cell_length_b   4.51
_cell_length_c   6.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   LaCoSi2
_chemical_formula_sum   'La2 Co2 Si4'
_cell_volume   137.92
_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
  La  La0  2  0.09  0.5  0.08  1.0
  Co  Co1  2  0.0  0.0  0.74  1.0
  Si  Si2  2  0.0  0.0  0.47  1.0
  Si  Si3  2  0.09  0.5  0.9  1.0

La Co Si Si
La Co Si Si 0 3 o o - 1 3 - - o 1 2 o o o 
LaCoSi2 crystallizes in the monoclinic Cm space group. La(1) is bonded in a single-bond geometry to one Si(2) and four equivalent Si(1) atoms. The La(1)-Si(2) bond length is 1.23 Å. There are a spread of La(1)-Si(1) bond distances ranging from 3.19-3.74 Å. Co(1) is bonded in a 5-coordinate geometry to one Si(1) and four equivalent Si(2) atoms. The Co(1)-Si(1) bond length is 1.89 Å. There are a spread of Co(1)-Si(2) bond distances ranging from 2.12-2.87 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Co(1) atom. In the second Si site, Si(2) is bonded in a single-bond geometry to one La(1) and four equivalent Co(1) atoms.