Fluor-buergerite

(repeating unit)NaFe3+3Al6(BO3)3Si6O18(O,F,OH)4IMA symbolFbu[1]Strunz classification9.CK.05Crystal systemTrigonalCrystal classDitrigonal pyramidal (3m)
H-M symbol: (3m)Space groupR3mIdentificationColorBronze, Dark Brown, Black, Dark PurpleCleavageDistinct prismaticMohs scale hardness7Streakyellowish brownDiaphaneityTranslucentSpecific gravity3.31Optical propertiesUniaxial (-)Refractive indexnω = 1.735 nε = 1.655Birefringenceδ = 0.080Other characteristicsPyroelectric and piezoelectricReferences[2][3][4]

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

  1. ^ 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.
  2. ^ a b Handbook of Mineralogy
  3. ^ a b Mindat
  4. ^ a b Webmineral data
  5. ^ 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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