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Yttrium, a rare earth metal, has a silver-grey color and metallic luster. It also appears highly crystalline. Yttrium displays chemical properties similar to those of rare earth elements. It dissolves in both mineral acids and alkalis, which are chemical opposites of one another.
Definition of YTTRIUM. : a metallic element usually included in the rare-earth group that occurs usually with other rare earth elements in minerals and is used especially in phosphors, YAG lasers, and superalloys â see element table.