The Mohs Scale of Hardness measures a mineral’s relative hardness and resistance to scratching between other minerals. It is one of the most important tests for identifying minerals. The Mohs scale was developed in 1820 by Austrian mineralogist Frederick Mohs. It is a qualitative ordinal scale from 1 to 10. When testing hardness, it is important to determine that a scratch was actually made rather than just a mark that can be rubbed off.
