Question: according to the mohs hardness scale what is the hardness of quartz
Answer: 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