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Tennantite



Tennantite

A sample of tennantite
General
CategoryMineral: sulfosalt
Chemical formulaCu12As4S13
Identification
Molecular Weight1,471.40 gm
ColorSteel gray to iron-gray
Crystal habitmassive to well formed crystals
Crystal systemCubic
CleavageNone
FractureHackly
Mohs Scale hardness3½ - 4
LusterMetallic
Streakreddish gray
Density4.65
DiaphaneityOpaque

Tennantite is a copper arsenic sulfosalt mineral. Its chemical formula is Cu12As4S13. It is found in hydrothermal veins and contact metamorphic deposits. It is grey-black, steel-gray, iron-gray or black in color. A closely related mineral, tetrahedrite (Cu12Sb4S13) has antimony substituting for arsenic and the two form a solid solution series. The two have very similar properties and is often difficult to distinguish between tennantite and tetrahedrite. Iron, zinc, and silver substitute up to about 15% for the copper site.

Additional recommended knowledge

The mineral was named after the English chemist Smithson Tennant (1761-1815).

See also

References

  • Min. galleries
  • Mindat.org
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tennantite". A list of authors is available in Wikipedia.
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