tennantite

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tennantite

[′ten·ən‚tīt]
(mineralogy)
(Cu,Fe)12 As4S13 A lead-gray mineral crystallizing in the isometric system; it is isomorphous with tetrahedrite; an important ore of copper.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.