|Color||Bronze, dark brown, black|
|Crystal system||Trigonal - ditrigonal pyramidal (3m)|
|Mohs scale hardness||7|
|Optical properties||Uniaxial (-)|
|Refractive index||nω = 1.735 nε = 1.655|
|Birefringence||δ = 0.080|
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.