Be₂FeY₂Si₂O₁₀

This sample of gadolinite is displayed in the Smithsonian Museum of Natural History. Gadolinite is a silicate mineral of yttrium and berylliumwith the composition Be₂FeY₂Si₂O₁₀. The sample at left is about 15 cm across and is from Saetersdalen, Norway. The mineral is named after J. Gadolin, the discoverer of yttrium. These samples are labeled gadolinite-(Y) because of the dominance of yttrium in the composition.

This gadolinite specimen is about 15 cm across and is from Iveland, Norway.

This gadolinite sample is about 18 cm across and is from Tuflau, Frikstad, Norway.