Fluoroberyllate is an anion of fluorine and beryllium and compounds containing it with other elements. The main kinds are the tetrafluoroberyllates (BeF<sub>4</sub>)<sup>2âÂÂ</sup>, the trifluoroberyllates (BeF<sub>3</sub>)<sup>âÂÂ</sup>, polymeric fluoroberyllates (which can crystalize similar to silica containing minerals) and fluoroberyllate glass.