What is the significance of crystal in the alchemist?

In "The Alchemist" by Paulo Coelho, crystal symbolizes clarity, transformation, and the pursuit of dreams. The crystal merchant's journey reflects the importance of embracing change and the potential for personal growth. As the protagonist Santiago observes the merchant's evolution, he realizes that following one's Personal Legend requires courage and the willingness to adapt, much like the way crystal forms and becomes more beautiful under pressure. Ultimately, crystal serves as a metaphor for the beauty that arises from perseverance and self-discovery.