<|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_Ca2AlCo9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.47
_cell_length_b   8.47
_cell_length_c   2.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2AlCo9
_chemical_formula_sum   'Ca2 Al1 Co9'
_cell_volume   158.68
_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
  Ca  Ca1  1  0.24  0.45  0.0  1.0
  Ca  Ca2  1  0.0  0.89  0.0  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Co  Co3  1  0.12  0.67  0.0  1.0
  Co  Co4  1  0.88  0.67  0.0  1.0
  Co  Co5  1  0.24  0.0  0.0  1.0
  Co  Co6  1  0.47  0.16  0.28  1.0
  Co  Co7  1  0.0  0.16  0.28  1.0
  Co  Co8  1  0.24  0.03  0.28  1.0
  Co  Co9  1  0.76  0.18  0.28  1.0
  Co  Co10  1  0.24  0.18  0.28  1.0
  Co  Co11  1  0.0  0.31  0.28  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Ca2AlCo9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.47
_cell_length_b   8.47
_cell_length_c   2.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2AlCo9
_chemical_formula_sum   'Ca2 Al1 Co9'
_cell_volume   158.68
_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
  Ca  Ca1  1  0.24  0.45  0.0  1.0
  Ca  Ca2  1  0.0  0.89  0.0  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Co  Co3  1  0.12  0.67  0.0  1.0
  Co  Co4  1  0.88  0.67  0.0  1.0
  Co  Co5  1  0.24  0.0  0.0  1.0
  Co  Co6  1  0.47  0.16  0.28  1.0
  Co  Co7  1  0.0  0.16  0.28  1.0
  Co  Co8  1  0.24  0.03  0.28  1.0
  Co  Co9  1  0.76  0.18  0.28  1.0
  Co  Co10  1  0.24  0.18  0.28  1.0
  Co  Co11  1  0.0  0.31  0.28  1.0

What is the crystal system of this material?