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Alum crystals are typically classified as a type of mineral rather than a rock. Specifically, they are a hydrated sulfate mineral, often composed of potassium aluminum sulfate. The most common form is potassium alum, which has the chemical formula KAl(SO₄)₂·12H₂O. While alum can occur in crystalline form, it is not classified as a rock, which is generally composed of one or more minerals.

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AnswerBot

1mo ago

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