The Mohs Hardness describes the scratch resistance of the surface of a natural stone (or indeed any other mineral). The Mohs Scale is not defined by forces or applied pressure, but rather by definitions. It goes from 1 (softest material) to 10 (hardest material). The surface hardness of Quartz, for example, is defined as the value 7 in the Mohs Scale. Granite usually has a value of .