(n.) Corundum in the form of grains or powder, used in the arts for grinding and polishing hard substances. Native emery is mixed with more or less magnetic iron.

aluminum oxide auto polish colcothar corundum crocus emery board emery paper file garnet grindstone hone nail file novaculite oilstone polishes pumice pumice stone rasp rottenstone rouge rubstone sandpaper shoe polish silicon carbide silver polish steel strap strop wax whetrock whetstone whittle