Before revision: Rosiwal scale values Mohs Mineral Rosiwal hardness1 Talc 0.032 Gypsum 1.253 Calcite 4.54 Fluorite 55 Apatite 5.56 Feldspar 377 Quartz 1208 Topaz 1759 Corundum 1,00010 Diamond 140,000 Measures the scratch hardness of a mineral expressed on a quantitative scale.
After revision: Rosiwal scale values Mohs Mineral Rosiwal hardness1 Talc 0.032 Gypsum 1.253 Calcite 4.54 Fluorite 55 Apatite 5.56 Feldspar 377 Quartz 1008 Topaz 1759 Corundum 1,00010 Diamond 140,000 Measures the scratch hardness of a mineral expressed on a quantitative scale.