<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.71
_cell_length_b   5.71
_cell_length_c   12.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   140.55
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si
_chemical_formula_sum   Si12
_cell_volume   263.74
_cell_formula_units_Z   12
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
  Si  Si0  1  0.93  0.24  0.03  1.0
  Si  Si1  1  0.93  0.76  0.7  1.0
  Si  Si2  1  0.93  0.24  0.06  1.0
  Si  Si3  1  0.93  0.76  0.67  1.0
  Si  Si4  1  0.93  0.76  1.0  1.0
  Si  Si5  1  0.93  0.24  0.73  1.0
  Si  Si6  1  0.93  0.76  0.37  1.0
  Si  Si7  1  0.93  0.24  0.36  1.0
  Si  Si8  1  0.93  0.94  0.58  1.0
  Si  Si9  1  0.93  0.06  0.15  1.0
  Si  Si10  1  0.93  0.94  0.52  1.0
  Si  Si11  1  0.93  0.06  0.21  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.71
_cell_length_b   5.71
_cell_length_c   12.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   140.55
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si
_chemical_formula_sum   Si12
_cell_volume   263.74
_cell_formula_units_Z   12
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
  Si  Si0  1  0.93  0.24  0.03  1.0
  Si  Si1  1  0.93  0.76  0.7  1.0
  Si  Si2  1  0.93  0.24  0.06  1.0
  Si  Si3  1  0.93  0.76  0.67  1.0
  Si  Si4  1  0.93  0.76  1.0  1.0
  Si  Si5  1  0.93  0.24  0.73  1.0
  Si  Si6  1  0.93  0.76  0.37  1.0
  Si  Si7  1  0.93  0.24  0.36  1.0
  Si  Si8  1  0.93  0.94  0.58  1.0
  Si  Si9  1  0.93  0.06  0.15  1.0
  Si  Si10  1  0.93  0.94  0.52  1.0
  Si  Si11  1  0.93  0.06  0.21  1.0

What is the crystal system of this material?