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gaylussite, a carbonate mineral, hydrated sodium and calcium carbonate [formulated Na2Ca(CO3)2·5H2O], that precipitates from soda lakes. It has been identified in deposits at Lagunillas, Venezuela; in the eastern Gobi (desert), Mongolia; near Ragtown, Nev., U.S.; at Borax Lake, Mono Lake, and Searles Lake, Calif., U.S.; and Independence Rock, Wyo., U.S. Gaylussite readily weathers to calcite. For detailed physical properties, see carbonate mineral (table).

This article was most recently revised and updated by Amy Tikkanen.