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Chalcocite with Pyrite

#45932

Chalcocite with Pyrite

#45932
Availability
Sold
Size
5 x 3.5 x 2.5 cm - Miniature 
Formula
Cu2S (RRUFF)
Locality
Butte dist., Silver Bow Co., Montana, United States
Tagged
sulfide , copper

Dull, black partial Chalcocite crystals to 2mm and formless "blebs" occur all over this specimens on the Pyrite and within the Quartz crystals. It is not the most aestheic specimen but is typical for Butte.

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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