Common tungstates include sodium tungstate (Na2WO4•2H2O), calcium tungstate (CaWO4), cobalt tungstate (CoWO4), cadmium tungstate (CdWO4), ferrous tungstate (FeWO4), ammonium tungstate [(NH4 ) 6W7O24 • 6H2O] and zinc tungstate (5ZnO • 12WO3) and so on. Among them, calcium tungstate and ferrous tungstate exist in scheelite and wolframite respectively. Ammonium salts and alkali metal tungstates are soluble in water, while other tungstates are insoluble.
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