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Meaning of alunogen

a•lu•no•gen

Pronunciation: (u-l'nu-jun), [key]
— n.
  1. a mineral, hydrous sulfate of aluminum, Al(SO)&multiplydot;18HO, occurring as a white, fibrous crust on quarry or mine walls.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.