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  1. A trigonal mineral, KAl3 (OH)6 (SO4 )2 ; massive or disseminated; in pale tints; formed from sulfuric acid acting on potassium feldspar in volcanic regions (alunization), and around fumaroles. Formerly called alumstone, alum rock, alumite.
  2. A mineral group including jarosite.
    Source: Dictionary of Mining, Mineral, and Related Terms

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