Mohs Scale of Mineral Hardness

Qualitative ordinal scale that characterizes the scratch resistance of various minerals

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

Related Topics

  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

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