MOH's
Hardness |
Mineral used for comparison |
Simple Hardness |
Cutting Hardness
(A. Rosiwal) |
| 10 |
Diamond |
|
140,000.00 |
| 9 |
Ruby, Sapphire, Alexandrite, Chrysoberyl |
|
1,000.00 |
| 8 |
Aquamarine, Emerald, Morganite, Spinel, Topaz |
|
175.00 |
| 7 |
Amethyst, Citrine, Garnet, Iolite, Kunzite, Peridot, Tanzanite, Tourmaline, Zircon |
Scratches window glass |
120.00 |
| 6 |
Diopside, Lapis lazuli, Orthoclase, Turquoise |
Can be scratched with a steel file |
37.00 |
| 5 |
Apatite, Obsidian, Sphene, Glass |
Can be scratched with a knife |
6.50 |
| 4 |
Coral, Fluorite, Pearl |
Can easily be scratched with a knife |
5.00 |
| 3 |
Calcite, Ivory |
Can be scratched with a copper coin |
4.50 |
| 2 |
Amber, Gypsum |
Can be scratched with a fingernail |
1.25 |
| 1 |
Talc |
Can be scratched with a fingernail |
0.03 |
