Ore Minerals

Bornite

with Pyrite - #65864

$45.00 - Available
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Locality: Butte dist., Silver Bow Co., Montana, United States
Formula: Cu₅FeS₄
Availability: Available
Price: $45.00
Size: 6.5 x 6 x 2.7 cm - Sm Cabinet
Tagged: sulfide , copper , ore specimen

Ore specimen of Bornite with Pyrite. Butte, of course, being one of the largest Copper producing mines in the world. It is no longer in operation.

Bornite carries up to 63% copper. It is a copper red when fresh, but quickly tarnishes to a dark purplish black and often iridescent.

Bornite

Formula: Cu₅FeS₄
Crystal System: Orthorhombic
Crystal Habit: Massive - Granular, Reniform, Granular
Cleavage: Imperfect, None, None
Luster: Metallic
Color: copper red, bronze brown, purple
Streak: grayish black
Class: Orthorhombic - Dipyramidal
Fracture: Conchoidal
Hardness: 3

Mineralpedia: View Bornite
On Dakota Matrix: Previously Sold Bornite
On Dakota Matrix: Other Available Bornite
WebMineral: View Bornite
Mindat: View Bornite

Chalcocite

#51281

$35.00 - Available
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Locality: Morenci mine, Greenlee Co., Arizona, United States
Formula: Cu₂S
Availability: Available
Price: $35.00
Size: 5 x 4 x 4.5 cm - Miniature
Tagged: ore mineral , sulfide , copper

Nice chunk of fresh Chalcocite with a shiny gray color. It is a little sectile with a grayish black streak. Chalcocite can be confused with the less common Digenite, which will carry a bluish black color when fresh. Chalcocite is nearly 80% Copper, which of course is a major ore.

The primary source of Chalcocite in the USA is the southwest corner of Arizona. The district started with small underground mines, where rich veins of copper sulfide minerals were encountered. Bornite, Chalcopyrite, Enargite, Cuprite and Covellite, were later found in "blanket" deposits formed by supergene enrichment, which prompted open pit mining by 1937. Today, the low-grade copper at the Morenci mine is found in disseminations through out the large copper porphyry deposit.

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

Mineralpedia: View Chalcocite
On Dakota Matrix: Previously Sold Chalcocite
On Dakota Matrix: Other Available Chalcocite
WebMineral: View Chalcocite
Mindat: View Chalcocite

Chalcocite

#51282

$40.00 - Available
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Locality: Morenci mine, Greenlee Co., Arizona, United States
Formula: Cu₂S
Availability: Available
Price: $40.00
Size: 4.5 x 4 x 3.5 cm - Miniature
Tagged: ore mineral , sulfide , copper

Nice chunk of fresh Chalcocite with a shiny gray color. It is a little sectile with a grayish black streak. Chalcocite can be confused with the less common Digenite, which will carry a bluish black color when fresh. Chalcocite is nearly 80% Copper, which of corse is a major ore.

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

Mineralpedia: View Chalcocite
On Dakota Matrix: Previously Sold Chalcocite
On Dakota Matrix: Other Available Chalcocite
WebMineral: View Chalcocite
Mindat: View Chalcocite

Chalcopyrite

in Quartz - #65762

$75.00 - Available
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Locality: Encampment dist., Carbon Co., Wyoming, United States
Formula: Cu¹⁺Fe³⁺S₂
Availability: Available
Price: $75.00
Size: 8 x 8 x 6 cm - Sm Cabinet
Tagged: ore mineral , sulfide , copper

Chalcopyrite in Quartz with Azurite and Malachite.

Interest in the Encampment area for mining began in 1876 veins of Quartz carrying silver, lead, and gold was discovered Frank O. Williams on Bridger group of claims near the Continental Divide several miles north of Encampment. The largest producer was the Farris-Haggarty mine which produced rich ore of copper from 1898 to 1902, when it was purchased by the North American Copper Company who produced copper concentrates and operated a 16 mile aerial tramway to the Ferris-Haggerty mine. This

This specimen was collected from the old millsite at the mine. It contains 1 to 2cm Chalcopyrite anhedral crystals in Quartz.