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An Updated and Extended Mohs Mineral Hardness Scale Friedrich Mohs (1773-1839), an Austrian/German mineralogist, developed a scale of hardness for minerals in 1812 (although some sources reference 1822). This hardness scale classifies minerals on a scale from one (the softest) to ten (the hardest) and has been used by mineralogists since its inception. The minerals Friedrich Mohs selected for... ادامه مطلب