Chemistry:Fluor-buergerite

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Fluor-buergerite
Buergerite-179849.jpg
General
CategoryCyclosilicate
tourmaline
Formula
(repeating unit)
NaFe3+3Al6(BO3)3Si6O18(O,F,OH)4
Strunz classification9.CK.05
Crystal systemTrigonal
Crystal classDitrigonal pyramidal (3m)
H-M symbol: (3m)
Space groupR3m
Identification
ColorBronze, Dark Brown, Black, Dark Purple
CleavageDistinct prismatic
Mohs scale hardness7
Streakyellowish brown
DiaphaneityTranslucent
Specific gravity3.31
Optical propertiesUniaxial (-)
Refractive indexnω = 1.735 nε = 1.655
Birefringenceδ = 0.080
Other characteristicsPyroelectric and piezoelectric
References[1][2][3]

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.[1][2][3]

References

  1. 1.0 1.1 Handbook of Mineralogy
  2. 2.0 2.1 Mindat
  3. 3.0 3.1 Webmineral data
  4. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W. 
  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". American Mineralogist 96 (5–6): 895–913. doi:10.2138/am.2011.3636. Bibcode2011AmMin..96..895H. http://pubsites.uws.edu.au/ima-cnmnc/henry%20et%20al%202011%20tourmaline%20tomenclature.pdf. Retrieved 2012-04-18.