<|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:
6.8 6.8 6.8
151 143 47
Sr
0.00 0.00 0.19
Y
0.00 0.00 0.60
Nb
0.00 0.00 0.23
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.8 6.8 6.8
151 143 47
Sr
0.00 0.00 0.19
Y
0.00 0.00 0.60
Nb
0.00 0.00 0.23
Identify the crystal system.