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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.

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