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Mineralpedia Details for Chalcocite

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Chalcocite

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 
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Chalcocite from Geevor Mine, Pendeen, St Just dist., Cornwall, England

Chalcocite
            from Geevor Mine, Pendeen, St Just dist., Cornwall, England

Small specimen with sharp, textbook, steel grey, pseudo-hexagonal Chalcocite crystals to 5mm. Historically significant mine known for its Chalcocite crystals as part of the Levant mine. 

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Chalcocite from Mountain Consolidated mine, Butte, Silver Bow Co., Montana, United States

Chalcocite
            from Mountain Consolidated mine, Butte, Silver Bow Co., Montana, United States
Special Info
Phillips Collection

Steel grey free-standing swords of Chalcocite to 9mm generally averaing 5mm. There is a slight iridescence of a blue tone.

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Chalcocite from Belmont mine, Butte, Silver Bow Co., Montana, United States

Chalcocite
            from Belmont mine, Butte, Silver Bow Co., Montana, United States

Excellent group of dull blackened Chalcocite crystals, the largest to 1cm.

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Chalcocite from Flambeau mine, Ladysmith, Rusk Co., Wisconsin, United States

Chalcocite
            from Flambeau mine, Ladysmith,  Rusk Co., Wisconsin, United States

Brassy to purple iridescent crude to nice Chalcocite crystals to 1cm in a cluster. More specifically the specimen came out of the Lucky Friday Pocket (1000 ft.) level.

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Chalcocite from Dzhezkazgan mine, Karagandy, Kazakhstan

Chalcocite
            from Dzhezkazgan mine, Karagandy, Kazakhstan

Nice pseudohexagonal cyclic twinned Chalcosite crystals to 8mm with a bluish iridescnce caused by probably Bornite.

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Chalcocite from Bisbee, Cochise Co., Arizona, United States

Chalcocite
            from Bisbee, Cochise Co., Arizona, United States

Excellent little, well-formed cyclic twinned Chalcocite crystals to 2mm on the side of mostly Bornite matrix.

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Chalcocite from Steward Mine, Butte dist., Silver Bow Co., Montana, United States

Chalcocite
            from Steward Mine, Butte dist., Silver Bow Co., Montana, United States

Twinned Chalcocite crystals to 3mm.

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Chalcocite from Tsumeb mine, Tsumeb, Namibia

Chalcocite
            from Tsumeb mine, Tsumeb, Namibia

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

Verified by EDS, this specimen of Chalcocite contains weird elongated, acicular crystals to 8mm.

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Chalcocite from Tincroft mine, Redruth dist., Cornwall, England

Chalcocite
            from Tincroft mine, Redruth dist., Cornwall, England

Superb specimen loaded with countless pseudo-hexagonal plates formed by twinning of monoclinic Chalcocite. Crystals such as these from Cornwall are highly sought after and valuable. The crystals are all nearly the same size from 4 to 7mm across and all nearly in perfect condition with good shiny luster. The Tincroft is another classic Cornish locality which mined early, shallow tin before converting to mining copper in the enriched zoned where this Chalcocite was likely found. 

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Chalcocite from Chino mine, Grant Co., New Mexico, United States

Chalcocite
            from Chino mine, Grant Co., New Mexico, United States

Steely grey, very homogenous mass of pure Chalcocite on phorphyry matrix.

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