Stephanite
Pronunciation : Steph"an*ite
Part of Speech : n.
Etymology : [So named after the Archduke Stephan, mining director of Austria.] (Min.)
Definition : Defn: A sulphide of antimony and silver of an iron-black color and metallic luster; called also black silver, and brittle silver ore.
Source : Webster's Unabridged Dictionary, 1913