tennantite: Meaning and Definition of

ten•nant•ite

Pronunciation: (ten'un-tīt"), [key]
— n.
  1. a mineral, copper arsenic sulfide, approximately CuAsS: a copper ore and an end member of a series of solid solutions into which antimony enters to form tetrahedrite.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.