If by any chance you spot an inappropriate image within your search results please use this form to let us know, and we'll take care of it shortly. Term » Definition. Word in Definition. Princeton's WordNet 0. Wiktionary 0. Wikipedia 4. Freebase 0. Matched Categories Corundum. How to pronounce aluminium oxide? Alex US English. David US English.
Mark US English. Daniel British. Libby British. Mia British. Karen Australian. Hayley Australian. Natasha Australian. Veena Indian. Metallic aluminum is reactive with oxygen , which could cause corrosion to build up.
However, when aluminum bonds with oxygen to form aluminum oxide, it creates a thin coating that protects it from oxidation.
This keeps the aluminum from corroding and losing strength. The thickness and other properties of the oxide layer can be changed by using the anodizing process. Aluminum oxide is also a product of the aluminum smelting process. Corundum Gemstones. The most common crystalline form of aluminum oxide is corundum. Both rubies and sapphires are gem-quality forms of corundum.
They owe their distinctive coloring to trace impurities. Rubies get their deep red color and laser qualities from traces of chromium. Sapphires come in a variety of colors, which come from other impurities like iron and titanium.
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