Mohs hardness Mineral Chemical formula Absolute hardness Image Talc Mg Si O (OH) Gypsum CaSO 2H O Calcite CaCO 9 Fluorite CaF 21 5 Apatite Ca (PO) (OH, Cl, F) 48 6 Orthoclase feldspar KAlSi O 72 7 Quartz SiO 100 8 Topaz Al SiO (OH, F) 200 9 Corundum Al O 400 10 Diamond 1500
what is diamonds rating on the mohs hardness scale
10 10