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Category Cyclosilicate
(repeating unit)
Strunz classification 9.CK.05
Crystal system Trigonal
Crystal class Ditrigonal pyramidal (3m)
H-M symbol: (3m)
Space group R3m
Color Bronze, dark brown, black
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 [1][2][3]

Fluor-buergerite,[4] 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]


  1. ^ a b Handbook of Mineralogy
  2. ^ a b Mindat
  3. ^ a b Webmineral data
  4. ^ 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: 895–913. doi:10.2138/am.2011.3636.