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Krennerite



Krennerite
CategoryTelluride mineral
Chemical formulaAuTe2
Identification
Molecular Weight452.17 gm
ColorWhite to blackish yellow
Crystal habitMassive to crystaline
Crystal systemOrthorhombic - Pyramidal
CleavagePerfect
FractureConchoidal
Mohs Scale hardness2.5
LusterMetallic
Optical PropertiesAnisotrophic
Pleochroismweak
Ultraviolet fluorescenceNone
Streakgreenish grey
Density8.53
Diaphaneityopaque
References[1] [2]

Krennerite is an orthorhombic gold telluride mineral which can contain a relatively small amount of silver in the structure. The formula is AuTe2 varying to (Au0.8,Ag0.2)Te2. Both of the chemically similar gold-silver tellurides, calaverite and sylvanite are in the monoclinic crystal system, whereas krennerite is orthorhombic.

The color varies from silver-white to brass-yellow. It has a specific gravity of 8.53 and a hardness of 2.5. It occurs in high temperature hydrothermal environments.

Krennerite was discovered in 1877 and first described by the Hungarian mineralogist Joseph Krenner (1839-1920).

See also

References

  1. ^ http://webmineral.com/data/Krennerite.shtml
  2. ^ http://www.mindat.org/min-2274.html
  • G. Tunnell and K. J. Murata, American Mineralogist 35, 359-384 (1950).
  • Structure of Krennerite retrieved 6-26-05
  • Euromineral retrieved 6-26-05
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Krennerite". A list of authors is available in Wikipedia.
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