Steph″an‐ite (?), n. [So named after the Archduke Stephan, mining director of Austria.] (Min.) A sulphide of antimony and silver of an iron-black color and metallic luster; called also black silver, and brittle silver ore.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.