Geology Collection / Mohs Scale

 

The hardness of a mineral is its resistance to being scratched. Hardness is one of many tests that can be performed on minerals to identify them. The scale of hardness was developed by Friedrich Mohs and is a relative scale. Minerals may be tested with other minerals in the Mohs Scale as well as everyday objects such as: fingernails (2.5), pennies (3.5), knives (5.5), and glass (5.5).

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Talc
Hardness: 1

Orthoclase
Hardness: 6
Gypsum
Hardness: 2
Quartz
Hardness: 7
Calcite
Hardness: 3
Topaz
Hardness: 8

Fluorite
Hardness: 4

Corundum
Hardness: 9
Apatite
Hardness: 5
Diamond
Hardness: 10