Avogadrite
Introduction '''Avogadrite''' ((K,Cs)BF4) is a potassium-caesium tetrafluoroborate in the halide class. Avogadrite crystallizes in the orthorhombic system (space group ''Pnma'') with cell parameters ''a'' 8.66 Å, ''b'' 5.48 Å and ''c'' Å 7.03.
History The mineral was discovered by the Italian mineralogist Ferruccio Zamboniniin 1926.He analyzed several samples from the volcanic fumaroles close to Mount Vesuvius and from the Lipari islands. In nature, it can only be found as a sublimation product around volcanic fumaroles. He named it after the Italian scientist Amedeo Avogadro (1776–1856).
Bibliography *Palache, P.; Berman H.; Frondel, C. (1960). "''Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)"'' John Wiley and Sons, Inc., New York, pp. 97-98.
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