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| Substance and Elements | Mohs Hardness |
|---|---|
| Caesium | 0.2 |
| Rubidium | 0.3 |
| Potassium | 0.4 |
| Sodium | 0.5 |
| Lithium | 0.6 |
| Talc | 1 |
| Indium | 1.2 |
| Thallium | 1.2 |
| Barium | 1.25 |
| Gallium | 1.5 |
| Strontium | 1.5 |
| Lead | 1.5 |
| Calcium | 1.75 |
| Graphite | 1-2 |
| Magnesium | 1-2.5 |
| Sulfur | 1.5-2.5 |
| Selenium | 2 |
| Cadmium | 2 |
| Bismuth | 2.25 |
| Tellurium | 2.25 |
| Kaolin | 2-2.5 |
| Gold | 2.5 |
| Silver | 2.5 |
| Zinc | 2.5 |
| Lanthanum | 2.5 |
| Cerium | 2.5 |
| Galena | 2.75 |
| Aluminium | 2.75 |
| Mica | 2-3 |
| Asbestos | 2.5-3 |
| Calcite | 3 |
| Copper | 3 |
| Antimony | 3 |
| Thorium | 3 |
| Baryte | 3-3.5 |
| Arsenic | 3.5 |
| Platinum | 3.5 |
| Dolomite | 3.5-4 |
| Fluorite | 4 |
| Iron | 4 |
| Nickel | 4 |
| Palladium | 4.75 |
| Calamine | 4.5-5 |
| Apatite | 5 |
| Zirconium | 5 |
| Cobalt | 5 |
| Beryllium | 5.5 |
| Molybdenum | 5.5 |
| Hafnium | 5.5 |
| Hornblende | 5-6 |
| Opal | 5.5-6 |
| Augite | 5.5-6 |
| Magnetite | 5.5-6.5 |
| Hematite | 5.5-6.5 |
| Niobium | 6 |
| Rhodium | 6 |
| Titanium | 6 |
| Manganese | 6 |
| Germanium | 6.25 |
| Pyrite | 6-6.5 |
| Feldspar | 6-6.5 |
| Silicon | 6.5 |
| Ruthenium | 6.5 |
| Iridium | 6.5 |
| Tantalum | 6.5 |
| Tanzanite | 6.5 |
| Vanadium | 6.7 |
| Peridot | 6.5-7 |
| Agate | 6.5-7 |
| Garnet | 6.5-7.5 |
| Andalusite | 6.5-7.5 |
| Silica | 7 |
| Osmium | 7 |
| Quartz | 7 |
| Rhenium | 7 |
| Tourmaline | 7-7.5 |
| Tungsten | 7.5 |
| Emerald | 7.5-8 |
| Spinel | 7.5-8 |
| Beryl | 7.5-8 |
| Topaz | 8 |
| Chromium | 9 |
| Corundum | 9 |
| Sapphire | 9 |
| Boron | 9.3 |
| Diamond | 10 |
| Carbonado | 10 |
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