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Mohs Hardness Scale
| Mineral | Mohs Relative Hardness | Rosiwal Absolute Hardness |
|---|---|---|
| Talc | 1 | 0.03 |
| Gypsum | 2 | 1.25 |
| Calcite | 3 | 4.5 |
| Fluorite | 4 | 5 |
| Apatite | 5 | 6.5 |
| Orthoclase | 6 | 37 |
| Quartz | 7 | 120 |
| Topaz | 8 | 175 |
| Corundum | 9 | 1,000 |
| Diamond | 10 | 140,000 |