Sylvanite
Pronunciation : Syl"van*ite
Part of Speech : n.
Etymology : [So called from Transylvania, where it was first found.] (Min.)
Definition : Defn: A mineral, a telluride of gold and silver, of a steel-gray, silver-white, or brass-yellow color. It often occurs in implanted crystals resembling written characters, and hence is called graphic tellurium. [Written also silvanite.]
Source : Webster's Unabridged Dictionary, 1913