What are two facts about turqoise?

Turquoise is a blue-to-green mineral that is often used as a gemstone in jewelry, valued for its unique color. It is one of the oldest known gemstones, with a history of use dating back thousands of years in various cultures, including ancient Egypt and Native American tribes. Additionally, turquoise is formed from the hydration of copper and aluminum-rich minerals, making it a secondary mineral that often occurs in arid regions.