<|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:
3.4 3.4 7.8
90 90 90
K
0.00 0.00 0.00
Ca
0.00 0.00 0.91
Ir
0.72 0.72 0.42
Ir
0.72 0.72 0.39
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.4 3.4 7.8
90 90 90
K
0.00 0.00 0.00
Ca
0.00 0.00 0.91
Ir
0.72 0.72 0.42
Ir
0.72 0.72 0.39
Identify the crystal system.