Carpholite is a rare mineral containing aluminum, magnesium, iron, silicate, and hydroxide. Synonyms for carpholite include magnesium iron aluminum silicate hydroxide, magnesium-iron aluminum hydroxide silicate, and magnesium-iron aluminum silicate. Carpholite is typically found in high-grade metamorphic rocks, such as those found deep in the earth's crust or in subduction zones. The mineral has been used as a tool for geologists to understand the geological history of an area and to determine the formation of rocks. Despite being a rare mineral, its unique properties and composition continue to intrigue scientists and mineral enthusiasts alike.