Mineralogical Hardness

Element

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Aluminum

2.75

Antimony

3.0

Arsenic

3.5

Barium

1.25

Beryllium

5.5

Bismuth

2.25

Boron

9.3

Cadmium

2.0

Calcium

1.75

Carbon

diamond

10.0

graphite

0.5

Cerium

2.5

Cesium

0.2

Chromium

8.5

Cobalt

5.0

Copper

3.0

Gallium

1.5

Germanium

6.0

Gold

2.5

Hafnium

5.5

Indium

1.2

Iridium

6.5

Iron

4.0

Lanthanum

2.5

Lead

1.5

Lithium

0.6

Magnesium

2.5

Manganese

6.0

Mercury

1.5

Molybdenum

5.5

Nickel

4.0

Niobium

6.0

Osmium

7.0

Palladium

4.75

Platinum

3.50

Potassium

0.4

Rhenium

7.0

Rhodium

6.0

Rubidium

0.3

Ruthenium

6.5

Selenium

2.0

Silicon

6.5

Silver

2.5

Sodium

0.5

Strontium

1.5

Sulfur

2.0

Tantalum

6.5

Tellurium

2.25

Thallium

1.2

Thorium

3.0

Tin

1.5

Titanium

6.0

Tungsten

7.5

Uranium

β-uranium

6.0

Vanadium

7.0

Zinc

2.5

Zirconium

5.0

Reference (Click the next to a value above to see complete citation information for that entry)

Samsonov, G. V., editor. Handbook of the Physicochemical Properties of the Elements. New York: Plenum Publishing Corporation, 1968.