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Definition: alum

A double sulphate formed of aluminium and some
other element (esp. an alkali metal) or of
aluminium. It has twenty-four molecules of water
of crystallization. Common alum is the double
sulphate of aluminium and potassium. It is white,
transparent, very astringent, and crystallizes
easily in octahedrons. The term is extended so as
to include other double sulphates similar to alum
in formula.

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