The Mohs Scale was developed by a German mineralogist, Friedrich Mohs, in 1812. The Mohs scale of mineral hardness is measure of one material scratching another. For example, everyone knows about testing a diamond on glass. A diamond has a hardness of 10 and glass is only 5. So, any material rated lower than 10 on the Mohs scale can be scratched by a diamond. Rather than reinvent the wheel and apply a new scale of hardness, This guide uses the Mohs Scale to rate the common counter surfaces. Below are popular counter materials in use around Austin listed in order from soft to hard.