Ytterby
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Ytterby is a village on the Swedish island of Resarö, in Vaxholm Municipality in the Stockholm archipelago. Today the residential area is dominated by suburban homes.
Ytterby quarry
Plaque of the ASM International society at the entrance of Ytterby mine
Terbiumvägen (Terbium Road) and Gruvvägen (Mine Road) close to the Ytterby mine (59°25′35″N 18°21′13″E / 59.4265°N 18.3535°E / 59.4265; 18.3535 (Ytterby mine))
Yttrium
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Yttrium is a chemical element; it has symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare-earth element". Yttrium is almost always found in combination with lanthanide elements in rare-earth minerals and is never found in nature as a free element. 89Y is the only stable isotope and the only isotope found in the Earth's crust.
Left: Soluble yttrium salts reacts with carbonate, forming white precipitate yttrium carbonate. Right: Yttrium carbonate is soluble in excess alkali metal carbonate solution.
Mira is an example of the type of red giant star in which most of the yttrium in the solar system was created.
Johan Gadolin discovered yttrium oxide.