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Aluminium Oxide
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| Aluminium Oxide | | Alumina |
Corundum is the most common naturally-occurring crystalline form of aluminium oxide. Much less-common rubies and sapphires are gem-quality forms of corundum with their characteristic colors due to trace impurities in the corundum structure.
| Impure Aluminium Oxide | | Emery Powder |
| Al2O3 | | Aluminium Oxide |
Corundum is the most common naturally-occurring crystalline form of aluminium oxide. Much less-common rubies and sapphires are gem-quality forms of corundum with their characteristic colors due to trace impurities in the corundum structure.