Wired: The Mohs Scale of Hardness, From Talc to Diamonds

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Datastream

Talc

1

Gypsum

2

Fingernail

2.5

Calcite

3

Copper penny

3

Tooth

5

Steel

5

Glass

5.5

Quartz

7

Porcelain

7.5

Topaz

8

Diamond

10

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