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Chalcocite with Siderite

#42753

Chalcocite with Siderite

#42753
Availability
Sold
Size
5.5 x 2 x 3 cm - Sm Cabinet 
Formula
Cu2S (RRUFF)
Locality
Tsumeb mine, Tsumeb, Namibia
Tagged
sulfide , copper

Elongated needle Chalcocite crystals to 8mm, some look to be spinel twins with discoidal Siderite.

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.

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