data_CrSi2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.54
_cell_length_b   2.54
_cell_length_c   10.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrSi2Se
_chemical_formula_sum   'Cr1 Si2 Se1'
_cell_volume   68.74
_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  0.0  0.0  0.0  1.0
  Si  Si2  1  0.27  0.27  0.78  1.0
  Si  Si3  1  0.27  0.27  0.91  1.0
  Se  Se1  1  0.0  0.0  0.34  1.0

data_CrSi2Se
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.59
_cell_length_b   3.59
_cell_length_c   10.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CrSi2Se
_chemical_formula_sum   'Cr2 Si4 Se2'
_cell_volume   137.49
_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
  Cr  Cr0  2  0.0  0.0  0.0  1.0
  Si  Si1  2  0.27  0.0  0.78  1.0
  Si  Si2  2  0.27  0.0  0.91  1.0
  Se  Se3  2  0.0  0.0  0.34  1.0

Cr Si Si Se
Cr Si Si Se 0 2 o o - 1 2 o o o 3 3 + o o 3 3 o + o 