tetrahedrite

[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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tetrahedrite (ˌtɛtrəˈhiːdraɪt)
 
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

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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
Less commonly of primary origin, disseminated in galena or tetrahedrite.
Argentiferous tetrahedrite is also abundant with a generally high silver
  content.
Silver was also produced from ores including tetrahedrite, stephanite, and
  pyrargyrite.
Also present are veins along aplitic intrusions containing argentiferous galena
  and tetrahedrite with bornite.
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