<|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:
6.7 6.7 6.7
149 149 43
Na
0.00 0.00 0.75
Ca
0.00 0.00 0.50
Rh
0.00 0.00 0.16
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.7 6.7 6.7
149 149 43
Na
0.00 0.00 0.75
Ca
0.00 0.00 0.50
Rh
0.00 0.00 0.16
Identify the crystal system.