10 Diamond

9 Corundum (Ruby, Sapphire)

8 Topaz

7 Quartz

6 Orthoclase (Feldspar)

5.5 Glass, steel knife

5 Apatite

4.5 Nail

4 Fluorite

3.5 Copper penny

3 Calcite

2.5 Fingernail

2 Gypsum

1 Talc