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Krennerite on Quartz Matrix

The Mineral krennerite




There are only few minerals that contain gold in their structure. The rare mineral Krennerite is one of them. Krennerite is a polymorph of Calaverite, and occurs in the same localities as Calaverite. They may even occur together on the same specimen. Krennerite was named in honor of Hungarian Mineralogist József Sándor Krenner (1839-1920), the curator of the Hungarian Mineral Museum.
Chemical Formula AuTe2
Composition Gold telluride, often with some silver
Variable Formula (Au,Ag)Te2
Color Brass-yellow to silver-white
Streak Grayish yellow to gray
Hardness 2.5 - 3
Crystal System Orthorhombic
3D Crystal Atlas
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Crystal Forms
and Aggregates		 In elongated prismatic crystals, and in short tabular crystals. Crystals are almost always striated lengthwise, and are usually small and in parallel or platy groupings. Also grainy, massive, and as coatings and crusts.
Transparency Opaque
Specific Gravity 8.0 - 8.6
Luster Metallic
Cleavage 1,1
Fracture Conchoidal to uneven
Tenacity Brittle
In Group Sulfides; Tellurides
Environment Low temperature hydrothermal replacement deposits.
Rock Type Sedimentary
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2


Krennerite AUCTIONS

POLYMORPHS
Calaverite


USES
Krennerite is a rare collector's mineral, with special value due to its gold content.

NOTEWORTHY LOCALITIES
The type locality where Krennerite was first described is Sacarîmb (Nagyág), Hunedoara Co., Romania. Other localities for this rare mineral include the Emperor Mine, Vatukoula, Viti Levu, Fiji; and the Cripple Creek District, Teller Co., Colorado.

COMMON MINERAL ASSOCIATIONS
Quartz, Calaverite, Sylvanite

DISTINGUISHING SIMILAR MINERALS
Can be very difficult to distinguish from Calaverite and other gold tellurides, though forms in different crystals and has perfect cleavage.


krennerite PHOTOS
 
ADDITIONAL RESOURCES
 
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