Mohs' Hardness Scale

Front 1

#1

Back 1

Talc

Front 2

#2

Back 2

Gypsum

Front 3

#3

Back 3

Calcite

Front 4

#4

Back 4

Fluorite

Front 5

#5

Back 5

Apatite

Front 6

#6

Back 6

Orthoclase (feldspar)

Front 7

#7

Back 7

Quartz

Front 8

#8

Back 8

Topaz

Front 9

#9

Back 9

Corundum (Ruby, Sapphire)

Front 10

#10

Back 10

Diamond