/ Thesaurus / B Synonyms of bastnasite Find synonyms for: Noun1. bastnasite, bastnaesite, mineralusage: a yellow-to-brown mineral that is a source of rare earth elementsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: industrious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language