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Meaning of tetrahedrite

tet•ra•he•drite

Pronunciation: (te"tru-hē'drīt), [key]
— n.
  1. a steel-gray or blackish mineral with a brilliant metallic luster, essentially copper and antimony sulfide, (Cu, Fe, Zn, Ag,) SbS, an end member of a series of solid solutions into which arsenic enters to form tennantite: mined as an ore of copper and silver.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.