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   » » Wiki: Tetrahedrite
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Tetrahedrite is a mineral with the formula: . It is the antimony endmember of the continuous series with -bearing . Pure endmembers of the series are rarely if ever seen in nature. Of the two, the antimony rich phase is more common. Other elements also substitute in the structure, most notably iron and zinc, along with less common silver, mercury and lead. Bismuth also substitutes for the antimony site and bismuthian tetrahedrite or annivite is a recognized variety. The related, silver dominant, mineral species , although rare, is notable in that it can contain up to 18% silver.


Mineralogy
Tetrahedrite gets its name from the distinctive shaped cubic crystals. The mineral usually occurs in massive form, it is a steel gray to black metallic mineral with of 3.5 to 4 and of 4.6 to 5.2.

Tetrahedrite occurs in low to moderate temperature veins and in some contact metamorphic deposits. It is a minor of copper and associated metals. It was first described in 1845 for occurrences in Freiberg, Saxony, . Historically, it was an important ore of copper, the formula CuSbS corresponding with 57.5% of the metal; it was also worked as an ore of silver, of which element it sometimes contains as much as 30%.


Applications
The now-defunct company announced plans to offer a device based on tetrahedrite to turn heat into electricity. The company claimed that other thermoelectrics typically produce about 2.5 percent efficiency, while tetrahedrite could achieve 5 to 10 percent.

Other thermoelectrics are either scarce, expensive ($24–146/kg vs $4 for tetrahedrite) and/or toxic. Working with a natural material also reduces manufacturing costs.


Images
File:Tetrahedrite-Chalcopyrite-Sphalerite-251531.jpg|Tetrahedrite crystals with chalcopyrite and sphalerite from the Casapalca Mine, Peru (size: 8.2 × 6.4 × 4.7 cm) File:Tetrahedrite-27120.jpg|Tetrahedrite from Casapalca Mine, Casapalca, Huarochiri Province, Lima Department, Peru File:Fluorite-Quartz-Rhodochrosite-ed10a.jpg|Rhodochrosite with fluorite, tetrahedrite and quartz; the tetrahedrite occurs as sharp, metallic crystals File:Quartz-Tetrahedrite-denv08-50b.jpg|Tetrahedrite crystals to several inches on size in combination with quartz crystals


See also


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