Mohs Hardness Scale

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Hardness Item
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase Feldspar
6 Titanium
7 Quartz
8 Topaz
9 Corundum
10 Diamond
2.5 to 3 gold, silver, aluminum
2.5 fingernail
4 platinum
4 to 5 iron
5.5 knife
6 to 7 glass
6.5 iron pyrite
7 to 8 hardened steel
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