Which of the following minerals is NOT a polymorph of Al\({}{2}\)SiO\({}{5}\)?

W) Andalusite [an-dl-OO-syt]

X) Aragonite [uh-RAG-uh-nyt]

Y) Sillimanite [SIL-uh-muh-nyt]

Z) Kyanite [KAY-uh-nyt]
X) ARAGONITE