Editing Gadolinite (section)

==Name and discovery==
Gadolinite was named in 1800 for [[Johan Gadolin]], the [[Finland|Finnish]] mineralogist-chemist who first isolated an oxide of the [[rare-earth element]] yttrium from the mineral in 1792. The rare earth [[gadolinium]] was also named after him. However, gadolinite does not contain more than trace amounts of gadolinium. When Gadolin analyzed this mineral, he missed an opportunity to discover a second element: the element he thought was [[aluminium]] (alumina) was in fact [[beryllium]] (beryllia), an element that was not officially identified until 1798.

Several elements were discovered as a consequence of lengthy analysis and decomposition of the ore gadolinite.{{Citation needed|date=July 2020}} As the ore was progressively analysed, the residue was first given the label [[ceria]], then [[lanthana]], and subsequently [[yttria]], [[erbia]], and [[terbia]]. In order of date discovered, the list of elements includes [[cerium]], [[lanthanum]], [[erbium]], [[terbium]], [[yttrium]], [[ytterbium]], [[holmium]], [[thulium]], [[scandium]], [[praseodymium]], [[neodymium]] and [[dysprosium]]. Several of these new elements were either discovered or isolated by [[Carl Gustaf Mosander]] in the 1830s and 1840s.