Alum

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  1. Any hydrous, alkali aluminum sulfate mineral, including kalinite, potassium alum, sodium alum, mendozite, tschermigite, and lonecreekite. Syn: potash alum
  2. A former name for kalinite and potassium alum.
  3. Any salts that are double sulfates of aluminum, chromium, iron, or manganese and one of the alkali metals.
    Source: Dictionary of Mining, Mineral, and Related Terms


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