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Old Aug 13, 2012 | 12:28 pm
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Originally Posted by Yaatri
Abundance---- natural occurrence. As far a I know rubies and sapphires are naturally occurring aluminium oxides too. And they are not as abundant as alumina.
Rubies and sapphires are alumina (aluminum oxide or AL2O3) with impurities. My point was that the ONLY oxide of aluminum is called alumina. There are no other oxides of aluminum. There are several oxides of iron because iron exists in several oxidation states: FeO, Fe2O3 (ferric oxide), and Fe3O4.
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