Fluor-buergerite
(repeating unit)NaFe3+3Al6(BO3)3Si6O18(O,F,OH)4 IMA symbol Fbu[1] Strunz classification 9.CK.05 Crystal system Trigonal Crystal class Ditrigonal pyramidal (3m)
H-M symbol: (3m) Space group R3m Identification Color Bronze, Dark Brown, Black, Dark Purple Cleavage Distinct prismatic Mohs scale hardness 7 Streak yellowish brown Diaphaneity Translucent Specific gravity 3.31 Optical properties Uniaxial (-) Refractive index nω = 1.735 nε = 1.655 Birefringence δ = 0.080 Other characteristics Pyroelectric and piezoelectric References [2][3][4]
H-M symbol: (3m)
Fluor-buergerite,[5] originally named buergerite, is a mineral species belonging to the tourmaline group. It was first described for an occurrence in rhyolitic cavities near Mexquitic, San Luis Potosi, Mexico. It was approved as a mineral in 1966 by the IMA and named in honor of Martin J. Buerger (1903–1986), professor of mineralogy at the Massachusetts Institute of Technology. It has also been reported from Minas Gerais, Brazil, and the Central Bohemia Region of the Czech Republic.[2][3][4]
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
- ^ a b Mindat
- ^ a b Webmineral data
- ^ Darrell J. Henry; Milan Novák; Frank C. Hawthorne; Andreas Ertl; Barbara L. Dutrow; Pavel Uher; Federico Pezzotta (2011). "Nomenclature of the tourmaline-supergroup minerals" (PDF). American Mineralogist. 96 (5–6): 895–913. Bibcode:2011AmMin..96..895H. doi:10.2138/am.2011.3636. S2CID 38696645. Archived from the original (PDF) on 2012-03-26. Retrieved 2012-04-18.
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