Boulangerite - Pb₅Sb₄S₁₁

Habit: Needlelike crystals, to 1 cm, rarely as tiny rings; fibrous, compact masses. Dull, lead-gray. Opaque, Metallic Luster.

Environment: In Hydrothermal veins formed at low to medium temperatures

Etymology: Named after Charles Louis Boulanger (1810-1849), French mining engineer, who called attention to the species.