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tennantite

tennantite Min.
  (ˈtɛnəntaɪt)
  [Named, 1819, in honour of Smithson Tennant: see -ite1.]
  A sulph-arsenide of copper and iron, closely related to tetrahedrite (Chester).

1839 H. T. De la Beche Rep. Geol. Cornwall, etc. xv. 590 From among them tennantite has been separated by Phillips. 1851 Mantell Petrifact. ii. §1. 78 In this case are specimens of..variegated copper ore; Tennantite. 1900 L. Fletcher in Brit. Mus. Return 156 A crystallographic and chemical research.., the result of which has been to establish the specific identity of Binnite and Tennantite.

Oxford English Dictionary

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