The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist <PERSON> And Gemstones, Crystals Minerals, Rocks And Minerals, Stones And Crystals, Gem Stones, Mohs Scale, Materials Science, Mineral Stone, Rocks And Gems