<|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:
4.0 4.0 7.5
90 90 119
Na
0.00 0.00 0.72
Ca
1.00 0.28 0.33
Hg
0.98 0.14 0.48
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.0 4.0 7.5
90 90 119
Na
0.00 0.00 0.72
Ca
1.00 0.28 0.33
Hg
0.98 0.14 0.48
Identify the crystal system.