<|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_Pu3Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.3
_cell_length_b   6.3
_cell_length_c   4.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pu3Ni
_chemical_formula_sum   'Pu6 Ni2'
_cell_volume   168.1
_cell_formula_units_Z   2
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
  Pu  Pu2  1  0.0  0.93  0.67  1.0
  Pu  Pu3  1  0.52  0.49  0.67  1.0
  Pu  Pu4  1  0.48  0.49  0.67  1.0
  Pu  Pu5  1  0.67  0.97  0.22  1.0
  Pu  Pu6  1  0.63  0.97  0.22  1.0
  Pu  Pu7  1  0.15  0.53  0.22  1.0
  Ni  Ni0  1  0.15  0.82  0.67  1.0
  Ni  Ni1  1  0.0  0.64  0.22  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Pu3Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.3
_cell_length_b   6.3
_cell_length_c   4.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pu3Ni
_chemical_formula_sum   'Pu6 Ni2'
_cell_volume   168.1
_cell_formula_units_Z   2
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
  Pu  Pu2  1  0.0  0.93  0.67  1.0
  Pu  Pu3  1  0.52  0.49  0.67  1.0
  Pu  Pu4  1  0.48  0.49  0.67  1.0
  Pu  Pu5  1  0.67  0.97  0.22  1.0
  Pu  Pu6  1  0.63  0.97  0.22  1.0
  Pu  Pu7  1  0.15  0.53  0.22  1.0
  Ni  Ni0  1  0.15  0.82  0.67  1.0
  Ni  Ni1  1  0.0  0.64  0.22  1.0

What is the crystal system of this material?