The story
After the Finnish chemist Johan Gadolin (1760-1852), + -ite.
Etymology from Wiktionary, CC BY-SA 4.0.
gadolinite
Today it means: A dark, vitreous mineral that is a complex mixture of silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron, with the chemical formula (Ce,La,Nd,Y)₂FeBe₂Si₂O₁₀. Full definition →