Usually we use MPa to descrip rock harness, following is the table for different rocks with roughly hardness
| NAME | Mpa |
| Rough rock | 196-343 |
| gabbro | 177-294 |
| diorite | 177-294 |
| basalt | 147-294 |
| quartzite | 147-294 |
| granite | 98-245 |
| Rhyolite porphyry | 98-245 |
| marble | 98-245 |
| slate | 98-196 |
| Dolomite | 78-245 |
| Quartz schist | 69-178 |
| Mica schist | 59-127 |
| tuff | 59-167 |
| gneiss | 49-196 |
| limestone | 29-245 |
| conglomerate | 19.6-196 |
| marl | 12-98 |
| shale | 4.9-49 |