table test
Created | Updated Sep 18, 2004
| Mohs Substance | Mohs Number | Common Substance | Simple Classification |
| Talc | 1 | SOFT | |
| Gypsum | 2 | ||
| 2.5 | Finger Nail | ||
| Calcite | 3 | MEDIUM | |
| Fluorite | 4 | 'Copper coin' 1 | |
| Apatite | 5 | ||
| 5.5 | Knife blade or glass | ||
| Orthoclase (feldspar) | 6 | HARD | |
| 6.5 | Steel file | ||
| Quartz | 7 | ||
| Topaz | 8 | ||
| Corundum (emery) | 9 | ||
| Diamond | 10 |
1 This may not be accurate now as the composition of UK 'copper' coins was changed from bronze to copper-coated steel in 1992. Hence the hardness may be different.
