tennantite

[ten-uh n-tahyt]
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.

Origin of tennantite

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