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0 item @ $0.00  

Chalcocite

#45922

Chalcocite

#45922
Availability
Sold
Size
5.5 x 4 x 1.5 cm - Sm Cabinet 
Formula
Cu2S (RRUFF)
Locality
4400' L, Steward mine, Butte dist., Silver Bow Co., Montana, United States
Tagged
sulfide , copper

At first glance this does not appear like much of a specimen. But upon closer examination under a scope there are literally hundreds of 1-2mm, dull gray, Chalcocite crystals, some nicely twinned. 

Chalcocite

Formula
Cu2
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.

Collection
Chris van Laer Collection

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