| Material |
Mohs' Hardness |
| Alumina (Synthetic aluminum oxide) |
3.4 |
| Aluminum oxide |
9 |
| Alundum (Fused brown Al203) |
9.0 |
| Amalgam |
4 - 5 |
| Anatase |
5.5 - 6 |
| Apatite |
5 |
| Barium sulfate |
3 |
| Boron carbide |
9 - 10 |
| Burundum |
9+ |
| Calcite |
3 |
| Chalk (calcium carbonate) |
3 |
| Chrysoberyl |
8.5 |
| Copper slag |
7 |
| Corundum (Natural aluminum oxide) |
9 |
| Crystolon (SiC) |
9.0 |
| Cuttlebone |
7 |
| Dentin |
3 - 4 |
| Diamond |
10 |
| Diopside |
5 - 6 |
| Emery |
7 - 9 |
| Enamel |
5 |
| Enstatite |
5.5 |
| Feldspar |
6 |
| Fluorite |
4 |
| Furnace slag |
7 |
| Garnet |
6.5 - 7.5 |
| Glass (lead free) |
7 |
| Glass Bead |
5.5 |
| Gold |
2.5 - 3 |
| Gypsum |
2 |
| Hematite |
5.5 - 6.5 |
| Kyanite |
4 - 7 |
| Magnetite |
5.5 - 6.5 |
| Olivine |
6.5 |
| Orthoclase |
6 |
| Petalite |
~ 6 |
| Plastic media |
3 - 4 |
| Porcelain, feldspathic |
6 - 7 |
| Pumice |
6 |
| Pyrite |
6.5 |
| Quartz (Silica sand) |
7 |
| Serpentine |
2 - 4 |
| Silica sand |
6 - 7 |
| Silicon carbide |
9 - 10 |
| Sillimanite |
6 - 7 |
| Soda (Sodium bicarbonate) |
2.5 |
| Specular hematite |
7 - 7.5 |
| Spinel |
~ 8 |
| Spodumene |
6 - 7 |
| Staurolite |
7.0 - 7.5 |
| Steatite (Soapstone) |
1 - 2.5 |
| Steel grit |
RC= 42 - 62 |
| Steel shot |
8 or
RC= 42 - 50 |
| Strontium titanate |
5 - 6 |
| Talc |
1 |
| Titanium dioxide, Anatase |
5.5 |
| Titanium dioxide, Rutile |
6.5 |
| Topaz |
8 |
| Tungsten carbide |
9 |
| YAG |
~ 8 1/4 |
| Zinc sulfide |
3 |
| Zirconia |
8 |
| Zirconium silicate (Zircon) |
6.5 - 7.5 |
|
