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tennantite

[ten-uh n-tahyt] /ˈtɛn ənˌtaɪt/
noun
1.
a mineral, copper arsenic sulfide, approximately Cu 3 AsS 3 : a copper ore and an end member of a series of solid solutions into which antimony enters to form tetrahedrite.
Origin
1830-1840
1830-40; after S. Tennant; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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