Category Halide mineral Strunz classification 3.CA.10 Space group Pnma | Formula
(repeating unit) (K,Cs)BF4 Crystal system Orthorhombic | |
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Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) | ||
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 Zambonini in 1926. He analyzed several samples from the volcanic fumaroles close to Mount Vesuvius and from the Lipari islands. As a result, it can only found as a sublimation product around volcanic fumaroles. He named it after the Italian scientist Amedeo Avogadro (1776–1856).
References
Avogadrite Wikipedia(Text) CC BY-SA