MOHS SCALE (hardness of minerals)

Soft[T 1]
1 Talc Mg3Si4O10(OH)2
2 Gypsum CaSO4·2H2O
Semi-hard[T 2]
3 Calcite CaCO3
4 Fluorite CaF2
5 Apatite Ca5(PO4)3(OH−,Cl−,F−)
Hard[T 3]
6 Orthoclase
7 Quartz SiO2 100
8 Topaz Al2SiO4(OH−,F−)2
9 Corundum Al2O3
10 Diamond (C)
Off-category maximum

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