Avogadrite
(repeating unit)(K,Cs)BF4 IMA symbol Avg[1] Strunz classification 3.CA.10 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnma Unit cell a = 8.6588, b = 5.48
c = 7.0299 [Å]; Z = 4 Identification Color Colorless to white, yellowish to reddish Crystal habit Tabular to platy octagonal crystals, tiny crystals, elongate Luster Vitreous, greasy Diaphaneity Translucent Specific gravity 2.9 Optical properties Biaxial (-) Refractive index nα = 1.3239, nβ = 1.3245, nγ = 1.3247 Birefringence δ = 0.001 2V angle 75°(meas), 58° (calc) Other characteristics Bitter taste References [2][3][4]
H-M symbol: (2/m 2/m 2/m)
c = 7.0299 [Å]; Z = 4
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. In nature, it can only be found as a sublimation product around volcanic fumaroles.[2] He named it after the Italian scientist Amedeo Avogadro (1776–1856).[5]
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.
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b "Handbook of Mineralogy: Avogadrite" (PDF). The Mineralogical Society of America. Archived from the original (PDF) on 2012-02-18. Retrieved 2010-01-09.
- ^ Avogadrite on Mindat.org
- ^ Avogadrite data on Webmin
- ^ Zambonini, Ferruccio (1926). "Sulla presenza, tra i prodotti dell'attuale attività del Vesuvio, di una varietà cesifera del fluoborato di potassio, (On the presence, among the products of Vesuvius, of a caesium-bearing variety of potassium fluoborate), Rend. Accad. Lincei". 6 (III): 644–649.
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