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Meaning of dawsonite

daw•son•ite

Pronunciation: (dô'su-nīt"), [key]
— n.
  1. an orthorhombic mineral, hydrous sodium aluminum carbonate, NaAlCO(OH), with a vitreous luster, occurring as white blade-shaped crystals: mined as an ore of aluminum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.