tet·ra·he·drite

[te-truh-hee-drahyt]
noun
a steel-gray or blackish mineral with a brilliant metallic luster, essentially copper and antimony sulfide, (Cu, Fe, Zn, Ag,) 12 Sb 4 S 13 , an end member of a series of solid solutions into which arsenic enters to form tennantite: mined as an ore of copper and silver.

Origin:
1865–70; tetrahedr(on) + -ite1, modeled on German Tetraedrit

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Collins
World English Dictionary
tetrahedrite (ˌtɛtrəˈhiːdraɪt) [Click for IPA pronunciation guide]
 
n
a grey metallic mineral consisting of a sulphide of copper, iron, and antimony, often in the form of tetrahedral crystals: it is a source of copper. Formula: (Cu,Fe)12Sb4S13

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Tetrahedrite is always a great word to know.
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a stew of meat, vegetables, potatoes, etc.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Encyclopedia Britannica
Encyclopedia

tetrahedrite

common sulfosalt mineral, an antimony sulfide of copper, iron, zinc, and silver [(Cu,Fe,Zn,Ag)12Sb4S13], that is an important ore of copper and sometimes of silver. It forms gray to black metallic crystals or masses in metalliferous hydrothermal veins. Tetrahedrite forms a solid solution series with the similar mineral tennantite, in which arsenic replaces antimony in the molecular structure. It is found in important quantities in Switzerland, Germany, Romania, the Czech Republic, France, Peru, and Chile, and both minerals occur in large amounts in Colorado, Idaho, and other localities in the western United States. For detailed physical properties, see sulfosalt (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Ores were primarily partially oxidized galena, pyrite and tetrahedrite.
Also present are veins along aplitic intrusions containing argentiferous galena
  and tetrahedrite with bornite.
Less commonly of primary origin, disseminated in galena or tetrahedrite.
The three main ore-bearing minerals are argentiferous galena, sphalerite, and
  argentiferous tetrahedrite.
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