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Chalcocite

#65554
SOLD
Chalcocite from Bisbee, Cochise Co., Arizona, United States - 65554
Chalcocite from Bisbee, Cochise Co., Arizona, United States - 65554

Chalcocite

#65554
Availability
Sold
Size
7 x 4.5 x 2.5 cm - Sm Cabinet 
Formula
Cu2S (RRUFF)
Locality
Bisbee, Cochise Co., Arizona, United States
Tagged
sulfide , copper

Choice specimen of Chalcocite from this important and historical copper district. The crystals are gray with a slight bluish tint and most of the crystals are single and are deeply striated. Some of the crystals show a typical pseudohexagonal habit, a result of cyclic twinning. The Butte district is known for some of the best Chalcocite crystals in the world.

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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