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Chalcocite with Pyrite & Tennantite

#45931

Chalcocite with Pyrite & Tennantite

#45931
Availability
Sold
Size
4.5 x 2.5 x 2.5 cm - Miniature 
Formula
Cu2S (RRUFF)
Locality
Butte dist., Silver Bow Co., Montana, United States
Tagged
sulfide , copper

The largest crystal is 9x6mm, most of the other crystals are between 1 to 3mm. All of the Chalcocite crystals are well-defined but a bit unusual as they are not your classic shape for Chalcocite. Chris van Laer was a little hesitant to call these Chalcocite. The matrix is composed of micro Pyrite with some dull black blebs of Tennantite(?).

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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