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Mohs Scale of Mineral Hardness

Qualitative ordinal scale that characterizes the scratch resistance of various minerals

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The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals or materials through the ability of a harder materials to scratch softer materials.

Mohs hardnessTypical Material
1 Talc
2 Gypsum, Rock salt
2.5 Fingernail, pure gold, silver, aluminum
3 Calcspar (calcite), copper coin (penny)
4 Fluorspar (fluorite)
4.5 Platinum, iron
5 Apatite
6 Felspar, orthoclase, titanium, spectrolite
6.5 Steelfile, iron pyrite, glass, vitreous pure silica
7 Quarts, amethyst, citrine, agate
7.5 Garnet
8 Topaz, hardened steel, beryl, emerald, aquamarine
9 Corundum, ruby, sapphire
9.5 Carborundum
10 Diamond
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