Mohs Hardness Scale

The scale was developed in 1822 by Friedrich Mohs, a German Geologist and mineralogist, as a method of describing the hardness of minerals and materials in science, however the technique is believed to be much older. It was mentioned in 300 BCE by Theophrastus in his treatise On Stones, and then again in 77 CE by Pliny the Elder in his Naturalis Historia.

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