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- 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.
- A mineral group including jarosite.
Source: Dictionary of Mining, Mineral, and Related Terms