<|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:
6.6 6.6 3.3
91 91 121
Ba
0.53 0.90 0.62
Ba
0.53 0.10 0.62
Zr
0.00 0.00 0.00
Nb
0.24 0.00 0.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.6 6.6 3.3
91 91 121
Ba
0.53 0.90 0.62
Ba
0.53 0.10 0.62
Zr
0.00 0.00 0.00
Nb
0.24 0.00 0.00
Identify the crystal system.