Dictionarya•lu•mi•nitePronunciation: (u-lOO'mu-nīt"), [key] —n. a mineral, hydrous aluminum sulfate, Al2(SO4)(OH)4·7H2O, occurring in white, chalky masses. Also called websterite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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