More on aluminum oxide from Fact Monster:

• alumina - alumina alumina or aluminum oxide,Al2O3, chemical compound with m.p. about 2,000°C and sp. gr. ...
• sandpaper - sandpaper sandpaper, abrasive originally made by gluing grains of sand to heavy paper sheets. Today ...
• abrasive - abrasive abrasive, material used to grind, smooth, cut, or polish another substance. Natural ...
• spinel - spinel spinel, magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, ...
• ruby - ruby ruby, precious stone, the transparent red variety of corundum, found chiefly in Myanmar, ...

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