Andalusite is a mineral that belongs to the aluminosilicate group, primarily composed of aluminum, silicon, and oxygen. It is known for its unique pleochroism, which means it can display different colors when viewed from different angles. Common colors include green, brown, and yellow, making it a popular choice for gemstones. This mineral typically forms in metamorphic rocks under specific temperature and pressure conditions. Andalusite is often used in jewelry and is valued for its durability and beauty. Additionally, it can be found in various locations worldwide, including Brazil, Spain, and the United States.