Geographic Minerals



Fluor-buergerite, 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 is named after M. J. Buerger, eminent crystallographer and President of Mineralogical Society of America (1947).

Buergerite is a rare species of the Tourmaline Group.

General Information

  • Category: Cyclosilicate tourmaline
  • Formula: NaFe3+3Al6(BO6)3Si6O18(O,F,OH)4
  • Crystal system: Trigonal
  • Crystal class: Ditrigonal pyramidal (3m).


  • Color: Bronze, dark brown, black
  • Cleavage: Distinct prismatic
  • Mohs scale hardness: 7
  • Streak: yellowish brown
  • Diaphaneity: Translucent
  • Specific gravity: 3.31

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.


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