Ore Minerals

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Bornite

#65898

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Locality: Magma mine, Pinal Co., Arizona, United States
Formula: Cu₅FeS₄
Availability: Sold
Size: 8.5 x 5.5 x 5 cm - Sm Cabinet
Tagged: sulfide , copper

A pure specimen of Bornite - when split reveals the true color of mineral. It is a coppery color with a purplish hue. The outer side of the specimen is a dark silvery gray with bluish iridescence. The specimen was collected underground by Dr. David London.

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

Collection: Dr. David London Collection

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Cassiterite

with Tourmaline - #65861

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Locality: North Goonbarrow China Clay Pit, St. Austell, Cornwall, England
Formula: SnO₂
Availability: Sold
Size: 9.5 x 5.5 x 5 cm - Cabinet
Tagged: ore mineral , tin

The combination of tourmaline with Cassiterite is quite unusual. The specimen is massive black Cassiterite with black tourmaline crystals to 7mm.

Cassiterite is the primary ore of tin aand carries 79% Sn (tin).

Cassiterite

Formula: SnO₂
Crystal System: Tetragonal
Crystal Habit: Prismatic, Massive, Botryoidal
Cleavage: Perfect, Indistinct, None
Luster: Adamantine
Color: brown, brownish black, colorless, green, gray
Streak: brownish white
Class: Tetragonal - Ditetragonal Dipyramidal
Fracture: Irregular
Hardness: 6-7

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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

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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

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On Dakota Matrix: Previously Sold Chalcocite
On Dakota Matrix: Other Available Chalcocite
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Chalcocite

#65777

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Locality: Magma mine, Pinal Co., Arizona, United States
Formula: Cu₂S
Availability: Sold
Size: 15 x 9 x 6.5 cm - Cabinet
Tagged: ore mineral , sulfide , copper

Another famous copper deposit in the Arizona southwest is the Magma mine, which began mining in 1910. It eventually closed in 1981 partially due to falling copper prices. The copper deposit mined hydrothermal replacements of limestone strata and as vein deposits produced by faulting.

This specimen is from the old underground workings and collected by Dr. David London, who carried it and loaded pack on a ladder 200 feet below the surface.

Today the Magma mine is currently under investigation by Resolution Copper (RCM) (https://resolutioncopper.com/project-overview ) . RCM is partnered with BHP and Rio Tinto and is said to be the largest copper deposit in the world and has reserves of up to 40 Billion pounds of copper in porphyry which underlies all the old workings at 5,000 to 7000 feet underground.

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

Collection: Dr. David London Collection

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On Dakota Matrix: Previously Sold Chalcocite
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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.

Chalcopyrite

Formula: Cu¹⁺Fe³⁺S₂
Crystal System: Tetragonal
Crystal Habit: Euhedral Crystals, Striated, Druse
Cleavage: Indistinct, None, None
Luster: Metallic
Color: brass yellow, honey yellow
Streak: greenish black
Class: Tetragonal - Scalenohedral
Fracture: Brittle
Hardness: 3.5

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On Dakota Matrix: Previously Sold Chalcopyrite
On Dakota Matrix: Other Available Chalcopyrite
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