Avogadrite

Avogadrite ((K,Cs)BF4) is a potassium-caesium tetrafluoroborate. 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. The mineral is only found as a sublimation product around volcanic fumaroles. ==History== The mineral was discovered by the Italian mineralogist Ferruccio Za...
Found on http://en.wikipedia.org/wiki/Avogadrite
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