gad·​o·​lin·​ite ˈga-də-lə-ˌnīt How to pronounce gadolinite (audio)
: a black or brown mineral that is a source of rare earths and consists of a silicate especially of iron, beryllium, yttrium, cerium, and erbium

Word History


borrowed from French, from Johan Gadolin †1852 Finnish chemist and mineralogist + -ite -ite entry 1

Note: Gadolin wrote a description of the mineral based on a sample found at the Ytterby quarry on the island of Resarö in the Stockholm Archipelago, Sweden ("Undersökning av en svart tung stenart ifrån Ytterby stenbrott i Roslagen," Kongl. Vetenskaps-Akademiens Nya Handlingar, vol. 15 [1794], pp. 137-55).

First Known Use

1801, in the meaning defined above

Time Traveler
The first known use of gadolinite was in 1801

Dictionary Entries Near gadolinite

Cite this Entry

“Gadolinite.” Dictionary, Merriam-Webster, Accessed 24 Jul. 2024.

More from Merriam-Webster on gadolinite

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!