<|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:
4.2 4.2 6.8
90 90 90
Na
0.00 0.00 0.00
Hg
0.93 0.47 0.39
Hg
0.93 0.53 0.39
Cl
0.93 0.00 0.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.2 4.2 6.8
90 90 90
Na
0.00 0.00 0.00
Hg
0.93 0.47 0.39
Hg
0.93 0.53 0.39
Cl
0.93 0.00 0.00
Identify the crystal system.