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The Mohs scale of mineral hardness characterises 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 Friedrich Mohs and is one of several definitions of hardness in materials science.

Malachite(scape) photography by Warren Krupsaw, a one-time student (and house guest) of Ansel Adams is a nature photographer concentrating on landscape & detail.