Tabular crystals of boulangerite. Field of view is about 1 cm. From the Noche Buena Mine, Zacatecas, Mexico; the specimen is in the University of Wisconsin–River Falls collection. (Photo by W. Cordua.)

Formula: Pb5Sb4S11 Monoclinic


Boulangerite is a rare hydrothermal mineral.

MARATHON COUNTY: Boulangerite occurs as acicular crystals up to 2 cm long within a dike in the Wausau Pluton. These crystals show bent and twisted habits (Falster, 1987).