|
Element |
Hardness on Mohs scale |
|
Caesium |
0.2 |
|
Rubidium |
0.3 |
|
Potassium |
0.4 |
|
Sodium |
0.5 |
|
Carbon graphite |
0.5 |
|
White phosphorus |
0.5 |
|
Lithium |
0.6 |
|
Indium |
1.2 |
|
Thallium |
1.2 |
|
Barium |
1.25 |
|
Strontium |
1.5 |
|
Mercury |
1.5 |
|
Gallium |
1.5 |
|
Tin |
1.5 |
|
Lead |
1.5 |
|
Calcium |
1.75 |
|
Cadmium |
2.0 |
|
Sulfur |
2.0 |
|
Selenium |
2.0 |
|
Bismuth |
2.3 |
|
Tellurium |
2.3 |
|
Magnesium |
2.5 |
|
Cerium |
2.5 |
|
Lanthanum |
2.5 |
|
Silver |
2.5 |
|
Gold |
2.5 |
|
Zinc |
2.5 |
|
Aluminium |
2.8 |
|
Copper |
3.0 |
|
Antimony |
3.2 |
|
Platinum |
3.5 |
|
Arsenic |
3.5 |
|
Iron |
4.0 |
|
Nickel |
4.0 |
|
Palladium |
4.8 |
|
Zirconium |
5.0 |
|
Cobalt |
5.0 |
|
Beryllium |
5.5 |
|
Hafnium |
5.5 |
|
Molybdenum |
5.5 |
|
Uranium |
6.0 |
|
Titanium |
6.0 |
|
Niobium |
6.0 |
|
Manganese |
6.0 |
|
Rhodium |
6.0 |
|
Germanium |
6.0 |
|
Ruthenium |
6.5 |
|
Tantalum |
6.5 |
|
Ruthenium |
6.5 |
|
Iridium |
6.5 |
|
Vanadium |
7.0 |
|
Rhenium |
7.0 |
|
Osmium |
7.0 |
|
Silicon |
7.0 |
|
Tungsten |
7.5 |
|
Chromium |
8.5 |
|
Boron |
9.3 |
|
Carbon diamond |
10.0 |
This list was taken from various sources.
