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MOHS hardness scale
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Mohs standard scale of mineral hardness and common materials
INDEX MINERAL COMMON MATERIALS
1 Talc [softest] --------------------
2 Gypsum --------------------
2.5 ---------------- Fingernail
3 Calcite Copper penny
4 Fluorite --------------------
5 Apatite --------------------
5.5 ---------------- Knife blade; window glass
6 Orthoclase --------------------
6.5 ---------------- Steel file
7 Quartz  
8 Topaz  
9 Corundum  
10 Diamond [hardest]  

Ed resources
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Birthstones

Geologic time scale

Geology museums

Glossary of terms

Mineral identification

MOHS hardness scale

US National Parks

US State Fossils

US State Gems/Minerals

US State Parks


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© 1998-2014 Memphis Archaeological and Geological Society. This page last updated 10.30.14.