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The Epic Interactive Encyclopedia 1997
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alumina
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1992-09-02
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9 lines
Oxide of aluminium, Al2O3, sometimes called
corundum, which is widely distributed in
clays, slates, and shales. It is formed by
the decomposition of the feldspars in
granite, and used as an abrasive. Typically
it is a white powder, soluble in most strong
acids or caustic alkalis, but not in water.
Impure alumina is called `emery'.