Bournonite
Pronunciation : Bour"non*ite
Part of Speech : n.
Etymology : [Named after Count Bournon, a minerologist.] (Min.)
Definition : Defn: A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.
Source : Webster's Unabridged Dictionary, 1913