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Mohs scale
A scale for determining the relative hardness of a mineral according to its resistance to scratching by one of the minerals in the table below.
| Mineral | Hardness |
| Talc Mg3Si4O10(OH)2 | 1 |
| Gypsum CaSO4·2H2O | 2 |
| Calcite CaCO3 | 3 |
| Fluorite CaF2 | 4 |
| Apatite Ca5(PO4)3(OH-,Cl-,F-) | 5 |
| Orthoclase KAlSi3O8 | 6 |
| Quartz SiO2 | 7 |
| Topaz Al2SiO4(OH-,F-)2 | 8 |
| Corundum Al2O3 | 9 |
| Diamond C | 10 |
The scale was devised by Friedrich Mohs (1773-1839).
Related category
• GEOLOGY AND PLANETARY SCIENCE
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