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Chalcocite with Chalcopyrite

#PD31046

Chalcocite with Chalcopyrite

#PD31046
Availability
Sold
Size
4 x 2 x 2 cm - Miniature 
Formula
Cu2S (RRUFF)
Locality
Flambeau mine, Ladysmith, Rusk Co., Wisconsin, United States

These pieces made a huge splash several years ago at the Tucson show. Many were just like this one with different irridescence presumably caused by a fine coating of Chalcopyrite. This one has large pseudohexagonal crystals to 1.5cm with a goldish purple irridescence. Excellent specimen.

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
Phillips Collection

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