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alunogen

American  
[uh-loo-nuh-juhn] / əˈlu nə dʒən /

noun

  1. a mineral, hydrous sulfate of aluminum, Al 2 (SO4 ) 3 ⋅18H 2 O, occurring as a white, fibrous crust on quarry or mine walls.


Etymology

Origin of alunogen

1865–70; < French alun ( alunite ) + -o- + -gen