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tennantite

[ten-uh n-tahyt]
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noun
  1. a mineral, copper arsenic sulfide, approximately Cu3AsS3: a copper ore and an end member of a series of solid solutions into which antimony enters to form tetrahedrite.
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Origin of tennantite

1830–40; after S. Tennant; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018