al·u·nite | \ ˈal-yə-ˌnīt 
, ˈa-lə- \
, ˈa-lə- \Definition of alunite
: a mineral that consists of a hydrous potassium aluminum sulfate and occurs in massive form or in rhombohedral crystals
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Time Traveler for alunite
The first known use of alunite was in 1821
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