<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following crystal representation:
2.8 2.8 10.4
90 90 90
Ca
0.00 0.00 0.00
Nb
0.41 0.41 0.53
Nb
0.00 0.00 0.20
Nb
0.41 0.41 0.86
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
2.8 2.8 10.4
90 90 90
Ca
0.00 0.00 0.00
Nb
0.41 0.41 0.53
Nb
0.00 0.00 0.20
Nb
0.41 0.41 0.86
Identify the crystal system.