Escala De Mohs
L'escala de Mohs es lo metòde principau per determinar la duretat d'un minerau.
Es un sistèma simple onte cada minerau raia lo precedent o es raiat per lo seguent. Lei mineraus de l'escala son :
| Duretat | Nom | Fòto | Estructura quimica |
| 1 | Talc |  | Mg3Si4O10(OH)2 |
| 2 | Gip |  | CaSO4, 2H2O |
| 3 | Calcita |  | CaCO3 |
| 4 | Fluorita |  | CaF2 |
| 5 | Apatita |  | Ca5(PO4)3(HO-, Cl-, F-) |
| 6 | Feldspat |  | KAlSi3O8 |
| 7 | Qüars |  | SiO2 |
| 8 | Topazi |  | Al2SiO4(HO-, F-)2 |
| 9 | Corindon |  | Al2O3 |
| 10 | Diamant |  | C |
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