Bournonite - PbCuSbS₃

Habit: Short prismatic to tabular crystals. forming cruciform or cogwheel aggregates; also massive, granular and compact. Steel-gray to black color, Metallic Luster, opaque.

Environment: Low to medium temperature Hydrothermal veins associated with galena, sphalerite, pyrite and chalcopyrite

Etymology: Named for French mineralogist, Jacques L. de Bournon (1751-1825)