Mohs Hardness Scale

Material Value
Talc-Mg3Si4(OH)2 1
Gypsum-CaSO4-2(H2O) 2
Calcite-CaCO3 3
Fluorite-CaF2 4
Apatite-Ca5(PO4)3(OH,F,Cl) 5
Orthoclase-KAlSi3O8 6
Quartz-SiO2 7
Topaz-Al2SiO4(F,OH)3 8
Corundum-Al2O3 9
Diamond-C 10








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