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0 item @ $0.00  

Sylvanite with Fluorite & Quartz

#47789

Sylvanite with Fluorite & Quartz

#47789
Availability
Sold
Size
7.5 x 5.5 x 4 cm - Sm Cabinet 
Formula
AgAuTe4 (RRUFF)
Locality
Spotted Horse mine, Fergus Co., Montana, United States
Tagged
telluride , silver , gold

Excellent specimen with three rather good, "large" crystals. The first pointing up is 3mm and the one on its side is 7mm. There is also another of good size and there are three smaller crystals to 2mm not shown.

You may have seen other specimens from this mine on Dakota Matrix in previous weeks. These were given to Bill Roberts of the SD School of Mines in the 1970's. Roberts later passed it on to my source. And that's all I know about this stuff.

Sylvanite

Formula
AgAuTe4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Skeletal, Platy 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
yellowish silver white, white 
Streak
steel gray 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
1.5-2 

Data courtesy of Webmineral.

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