gad·​o·​lin·​ite | \ ˈga-də-lə-ˌnīt How to pronounce gadolinite (audio) \

Definition of gadolinite

: 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

First Known Use of gadolinite

1801, in the meaning defined above

History and Etymology for gadolinite

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).

Keep scrolling for more

Learn More about gadolinite

Time Traveler for gadolinite

Time Traveler

The first known use of gadolinite was in 1801

See more words from the same year

Statistics for gadolinite

Cite this Entry

“Gadolinite.” Dictionary, Merriam-Webster, Accessed 25 Jan. 2021.

More from Merriam-Webster on gadolinite Encyclopedia article about gadolinite

Comments on gadolinite

What made you want to look up gadolinite? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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