<|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:
4.9 6.4 6.4
33 90 90
Y
0.00 0.00 0.30
Y
0.45 0.00 0.21
Mg
0.00 0.00 0.23
Tl
0.45 0.00 0.98
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.9 6.4 6.4
33 90 90
Y
0.00 0.00 0.30
Y
0.45 0.00 0.21
Mg
0.00 0.00 0.23
Tl
0.45 0.00 0.98
Identify the crystal system.