Abrasive materials are substances used to grind, polish, or clean surfaces. Pumice (6 letters), EMERY (5 letters), GRIT (4 letters), and Sandpaper (9 letters) are all examples of abrasive materials. Pumice is a light, porous volcanic rock that is often used in cleaning and polishing. EMERY is a dark, granular rock composed of corundum, magnetite, and other minerals. GRIT is an abrasive material made from crushed stone, steel, or ceramic. Sandpaper is a paper-like material coated with an abrasive material such as aluminum oxide.