Buergerite is a silicate which contains boron with composition NaFe₃Al₆(BO₃)₃Si₆O₁₈(O,F)₄. This sample is about 18x16 cm and is from Mexiquitic, San Luis Potosi, Mexico. It is on display at the Smithsonian Museum of Natural History.

Mindat: Buergerite