Rock Hardness References

Hardness of Rock

Soft:

Medium:

Hard:

Very Hard:

MOHS
Scale of Hardness

TESTING
(you can do in the field)

Talc
Slate
Gypsum rock
Asbestos rock
Soft limestone
Limestone
Dolomite
Sandstone
Copper Ore
Granite
Quartzite
Iron ore
Trap rock
Gravel
Gabro
Iron ore (Taconite)
Granite
Grantic gravel
Trap rock
1 - Talc
2 - Gypsum
3 - Clacite
4 - Flourite
5 - Apatite
6 - Orthoclase
7 - Quartz
8 - Topaz
9 - Corundum
10 - Diamond
Scratched With:
Fingernail
Copper coin
Pocket knife
Window glass
Steel File
Hardness:
little over 2
about 3
little over 5
5.5
6.5



Typical Rock Hardness

Rock:

Toughness:

Rock:

Toughness:

Fresh Diabase (Trap)
Pyroxene Quartzite
Sandstone
Altered Diabase
Fresh Basalt
Hornblende Schist
Diorite
Hornblende Granite
Rhyolite
Quartzite
Biotite Gneiss
Augite Diorite
Altered Basalt
Feldspathic Sandstone
Gabbro
3.0
2.7
2.6
2.4
2.3
2.1
2.1
2.1
2.0
1.9
1.9
1.9
1.7
1.7
1.6
Chert
Calcareous Sandstone
Granite
Slate
Peridotite
Granite Gneiss
Andesite
Limestone
Mica Schist
Amphibolite
Dolomite
Biotite Granite
Augite Syenite
Hornblende Gneiss
1.5
1.5
1.5
1.2
1.2
1.2
1.1
1.0
1.0
1.0
1.0
1.0
1.0
1.0

 

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