gadolinite

[gad-l-uh-nahyt]
noun
a silicate mineral from which the rare-earth metals gadolinium, holmium, and rhenium are extracted.

Origin:
1795–1805; named after J. Gadolin (1760–1852), Finnish chemist; see -ite1

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gadolinite (ˈɡædəlɪˌnaɪt)
 
n
Also called: ytterbite a rare brown or black mineral consisting of a silicate of iron, beryllium, and yttrium in monoclinic crystalline form. Formula: 2BeO.FeO.Y2O3.2SiO2
 
[C19: named after Johan Gadolin (1760--1852), Finnish mineralogist]

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Example sentences
They also found the element in gadolinite and molybdenite.
Produced a few hundred kilograms of yttrotantalite and gadolinite.
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