alunogen

[ uh-loo-nuh-juh n ]
/ əˈlu nə dʒən /

noun

a mineral, hydrous sulfate of aluminum, Al2(SO4)3⋅18H2O, occurring as a white, fibrous crust on quarry or mine walls.

Origin of alunogen

1865–70; < French alun (see alunite) + -o- + -gen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019