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[daw-suh-nahyt] /ˈdɔ səˌnaɪt/
an orthorhombic mineral, hydrous sodium aluminum carbonate, NaAlCO 3 (OH) 2 , with a vitreous luster, occurring as white blade-shaped crystals: mined as an ore of aluminum.
named after J.W. Dawson; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for dawsonite

a carbonate mineral, NaAlCO3 (OH)2, that is probably formed by the decomposition of aluminous silicates. Of low-temperature, hydrothermal origin, it occurs in Montreal, where it was first discovered; near Monte Amiata, Tuscany, Italy; and in Algiers. In the oil shale near Green River, Wyo., U.S., it occurs as extensive beds that constitute a source of aluminum. For detailed physical properties, see carbonate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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