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The Collaborative International Dictionary of English v.0.48:

Stephanite \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. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Brittle \Brit"tle\, a. [OE. britel, brutel, AS. bryttian to dispense, fr. bre['o]tan to break; akin to Icel. brytja, Sw. bryta, Dan. bryde. Cf. Brickle.] Easily broken; apt to break; fragile; not tough or tenacious. [1913 Webster] Farewell, thou pretty, brittle piece Of fine-cut crystal. --Cotton. [1913 Webster] Brittle silver ore, the mineral stephanite. [1913 Webster]