<|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:
8.7 4.2 7.6
90 90 90
Ca
0.19 0.00 0.06
Ca
0.56 0.00 0.52
Mg
0.18 0.11 0.29
Mg
0.93 0.11 0.29
Mg
0.56 0.11 0.30
Mg
0.81 0.11 0.30
Mg
0.19 0.11 0.36
Mg
0.56 0.11 0.22
Mg
0.00 0.00 0.00
Mg
0.37 0.00 0.00
Cu
0.19 0.00 0.09
Cu
0.56 0.00 0.50
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
8.7 4.2 7.6
90 90 90
Ca
0.19 0.00 0.06
Ca
0.56 0.00 0.52
Mg
0.18 0.11 0.29
Mg
0.93 0.11 0.29
Mg
0.56 0.11 0.30
Mg
0.81 0.11 0.30
Mg
0.19 0.11 0.36
Mg
0.56 0.11 0.22
Mg
0.00 0.00 0.00
Mg
0.37 0.00 0.00
Cu
0.19 0.00 0.09
Cu
0.56 0.00 0.50
Identify the crystal system.