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Chalcocite with Chalcopyrite - copper ore

#58564
SOLD
Chalcocite from Ferris-Haggarty mine, Encampment dist., Carbon Co., Wyoming, United States - 58564
Chalcocite from Ferris-Haggarty mine, Encampment dist., Carbon Co., Wyoming, United States - 58564

Chalcocite with Chalcopyrite - copper ore

#58564
Availability
Sold
Size
7 x 56 x 7 cm - Cabinet 
Formula
Cu2S (RRUFF)
Locality
Ferris-Haggarty mine, Encampment dist., Carbon Co., Wyoming, United States
Tagged
sulfide , copper , ore specimen

Greyish black Chalcocite with iridescent Chalcopyrite in host rock. The Ferris-Haggarty mine was an important copper mine and produced an estimated 21 million pounds of copper. in the early 1900's. Accordning to the website Western Mining History the deposit contains 928,000 tins of copper ore at 6.5% Cu and 116,800 oz Au. This specimen was pulled from an ore carts encountered during activity in the late 1990's. 

Chalcocite

Formula
Cu2S 
Crystal System
Monoclinic 
Crystal Habit
Massive, Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
blue black, gray, black, black gray, steel gray 
Streak
grayish black 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2.5-3 

Data courtesy of Webmineral.

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