<|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:
10.9 10.9 10.9
15 15 15
Na
0.00 0.00 0.13
Na
0.00 0.00 0.70
Mg
0.00 0.00 0.79
Ru
0.00 0.00 0.04
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
10.9 10.9 10.9
15 15 15
Na
0.00 0.00 0.13
Na
0.00 0.00 0.70
Mg
0.00 0.00 0.79
Ru
0.00 0.00 0.04
Identify the crystal system.