fluoroberyllate
Fluoroberyllate is an anion of fluorine and beryllium and compounds containing it with other elements. The main kinds are the tetrafluoroberyllates (BeF4)2−, the trifluoroberyllates (BeF3)−, polymeric fluoroberyllates (which can crystalize similar to silica containing minerals) and fluoroberyllate glass.{{cite book|last1=Emeléus|first1=Harry Julius|last2=Sharpe|first2=A. G.|title=Advances in Inorganic Chemistry and Radiochemistry|url=https://books.google.com/books?id=VupzlLU9NB0C&pg=PA271|accessdate=13 July 2013|date=1972-12-06|publisher=Academic Press|isbn=9780080578637|pages=271–275}}