Emery is a natural abrasive material made from a type of rock called corundum, which is primarily composed of aluminum oxide. It is often used in the form of powder or as a bonded material on sanding discs and belts. Emery is valued for its hardness and durability, making it effective for polishing and grinding various surfaces, including wood and metal. Historically, emery was mined from deposits found on the Greek island of Naxos. Today, synthetic alternatives are also available, but natural emery remains popular in certain applications due to its unique properties. It is commonly used in woodworking, metalworking, and even in some cosmetic products for exfoliation.