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Mohs Hardness

Hardness is measured on the Moh's hardness scale. Each of the values is a naturally occuring mineral. Testing devices (e.g. pencils) mount these in the tip.

10 Diamond
9 Corundum
8 Topaz
7 Quartz
6 Feldspar
5 Apatite
4 Fluorspar
3 Calcite
2 Gypsum
1 Talc

Ceramic glazes are the obvious candidate for this type of testing. If a specimen to be tested can be scratched by a mineral from the list, it is softer than that mineral. If it in turn will scratch another known mineral, it is harder than that mineral.

Related Information

Links

Tests	Hardness (Moh)
Tests	Glaze Hardness
URLs	http://www.gordonengland.co.uk/hardness/mohs.htm Background Information on Mohs Hardness

By Tony Hansen

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