Blende

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Blende

(n.) A mineral, called also sphalerite, and by miners mock lead, false galena, and black-jack. It is a zinc sulphide, but often contains some iron. Its color is usually yellow, brown, or black, and its luster resinous.
(n.) A general term for some minerals, chiefly metallic sulphides which have a somewhat brilliant but nonmetallic luster.