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In 1880, Jean-Charles-Galinard de Marignac isolated the oxide of gadolinium. Then, in 1886, a chemist named Paul-Émile Lecoq de Boisbaudran who was a co-discoverer of the oxide, persuaded de Marignac to name the oxide gadolinia after Johan Gadolin, a chemist from Finland. It was not until 1935 that pure elemental, mettalic gadolinium was purified by a French chemist named F. Trombe.

                                               
    Sir Johan Gadolin                                                         Gadolinite                                     Jean-Charles-Galinard de Marignac

Other rare earth elements that are found in the mineral gadolinite are yttrium, and erbium along with smaller amounts of cerium and lanthanum.



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