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Corundum
| Chemical Formula | Al2O3 |
| Mohs Hardness | 9 |
| Specific gravity | 4-4.1 |
| Description | Corundum is a crystallne form of aluminium oxide, often used in ancient jewelry. It usualy has a hexgonal shape. If it conatins chromium it would become a ruby, and if it conatins iron, it would turn out to be a sapphire. Corundum is also famous for its hardness and fire resistance. It used for jewelry, abrasive, and heat resistant material. |
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