Hardness Index

Mohs Hardness

Substance and Elements

0.2

Caesium

0.3

Rubidium

0.4

Potassium

0.5

Sodium

0.6

Lithium

1

Talc

1.2

Indium

1.2

Thallium

1.25

Barium

1.5

Gallium

1.5

Strontium

1.5

Lead

1.75

Calcium

1-2

Graphite

1-2.5

Magnesium

1.5-2.5

Sulfur

2

Selenium

2

Cadmium

2.25

Bismuth

2.25

Tellurium

2-2.5

Kaolin

2.5

Gold

2.5

Silver

2.5

Zinc

2.5

Lanthanum

2.5

Cerium

2.75

Galena

2.75

Aluminium

2-3

Mica

2.5-3

Asbestos

3

Calcite

3

Copper

3

Antimony

3

Thorium

3-3.5

Baryte

3.5

Arsenic

3.5

Platinum

3.5-4

Dolomite

4

Fluorite

4

Iron

4

Nickel

4.75

Palladium

4.5-5

Calamine

5

Apatite

5

Zirconium

5

Cobalt

5.5

Beryllium

5.5

Molybdenum

5.5

Hafnium

5-6

Hornblende

5.5-6

Opal

5.5-6

Augite

5.5-6.5

Magnetite

5.5-6.5

Hematite

6

Niobium

6

Rhodium

6

Titanium

6

Manganese

6.25

Germanium

6-6.5

Pyrite

6-6.5

Feldspar

6.5

Silicon

6.5

Ruthenium

6.5

Iridium

6.5

Tantalum

6.5

Tanzanite

6.7

Vanadium

6.5-7

Peridot

6.5-7

Agate

6.5-7.5

Garnet

6.5-7.5

Andalusite

7

Silica

7

Osmium

7

Quartz

7

Rhenium

7-7.5

Tourmaline

7.5

Tungsten

7.5-8

Emerald

7.5-8

Spinel

7.5-8

Beryl

8

Topaz

9

Chromium

9

Corundum

9

Sapphire

9.3

Boron

10

Diamond

10

Carbonado

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