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Mohs hardness scale

The Mohs Scale of Mineral Hardness

The Mohs Scale is a scale that measures hardness of solid objects, mainly rocks and minerals. A mineralogist named Friedrich Mohs invented it in 1812.

The original scale is below:

Mineral NameHardness
Talc1
Gypsum2
Calcite3
Fluorite4
Apatite5
Orthoclase Feldspar6
Quartz7
Topaz8
Corundum9
Diamond10


Diagnostic tools:

Mineral NameHardness
Fingernail2.5
Copper Penny3
Glass plate or Steel knife5.5
Steel file6.5


ReferenceEdit

http://www.oakton.edu/user/4/billtong/eas100lab/hardness.htm

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