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Ore Minerals

Friday, 30 May 2025 10:30 AM

Introducing the "Ore Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including acanthite, arsenopyrite, bornite and more from places like Niederschlema, Erzgebirge, Saxony, Germany, Hope mine, Philipsburg, Granite Co., Montana, United States, Homestake mine, Lawrence Co., South Dakota, United States, Thunderbird mine, Ouray Co., Colorado, United States, Eskay Creek mine, Iskut River, British Columbia, Canada, and Butte dist., Silver Bow Co., Montana, United States.

SOLD

Acanthite

#65524

Details
Data
Provenance
Resources

Locality: Niederschlema, Erzgebirge, Saxony, Germany
Formula: Ag₂S
Availability: Sold
Size: 7 x 5 x 4 cm - Sm Cabinet
Tagged: ore mineral , sulfide , silver

Dark gray crude crystals of Acanthite through Quartz mass from a historic Silver mine.

Acanthite

Formula: Ag₂S
Crystal System: Monoclinic
Crystal Habit: Blocky, Skeletal, Arborescent
Cleavage: poor to none
Luster: Metallic
Color: lead gray, gray, iron black
Streak: shining black
Class: Monoclinic - Prismatic
Fracture: Sectile
Hardness: 2-2.5

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

SOLD

Acanthite

silver ore with Chlorargerite - #65765

Details
Data
Provenance
Resources

Locality: Hope mine, Philipsburg, Granite Co., Montana, United States
Formula: Ag₂S
Availability: Sold
Size: 9 x 5.5 x 3.5 cm - Sm Cabinet
Tagged: ore mineral , sulfide , silver

This is a little known locality from Philipsburge, Montana. Behind the old town is a large district which produced manganese, one of the largest in the country. This mine, as with some others in the district, produced Silver. This specimen contains black, sectile Acanthite and associated with brown Chlorargyrite. This material assyed 1100 oz/t Silver.

Acanthite

Formula: Ag₂S
Crystal System: Monoclinic
Crystal Habit: Blocky, Skeletal, Arborescent
Cleavage: poor to none
Luster: Metallic
Color: lead gray, gray, iron black
Streak: shining black
Class: Monoclinic - Prismatic
Fracture: Sectile
Hardness: 2-2.5

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

SOLD

Arsenopyrite

with Pyrite - #65783

Details
Data
Provenance
Resources

Locality: Homestake mine, Lawrence Co., South Dakota, United States
Formula: FeAsS
Availability: Sold
Size: 10 x 7 x 6 cm - Cabinet
Tagged: ore mineral , sulfide

This specimen, from the Homestake mine, is loaded with large 1.5cm anhedral Pyrite and striated, silvery Arsenopyrite crystals showing diamond-shaped outlines and measures up to 6mm and also large massesto 2cm. The matrix is the Homestake Fm, a chloritic schist. It is gold bearing but is not visible. Arsenopyrite when dissolved in HCl will yield tiny bits of Gold.

Arsenopyrite

Formula: FeAsS
Crystal System: Monoclinic
Crystal Habit: Striated, Euhedral Crystals, Prismatic
Cleavage: one distinct
Luster: Metallic
Color: tin white, light steel gray
Streak: black
Geological Setting: Widespread. Most commonly found in medium to high temperature veins.
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 5.5 to 6

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

SOLD

Bornite

#AH59243

Details
Data
Provenance
Resources

Locality: Thunderbird mine, Ouray Co., Colorado, United States
Formula: Cu₅FeS₄
Availability: Sold
Size: 9 x 5 x 6 cm - Sm Cabinet
Tagged: ore mineral , sulfide , copper

Silvery black and with good purple iridescence

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: Arnold G Hampson Collection

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

SOLD

Bornite

(gold ore) - #65764

Details
Data
Provenance
Resources

Locality: Eskay Creek mine, Iskut River, British Columbia, Canada
Formula: Cu₅FeS₄
Availability: Sold
Size: 10 x 6 x 1.5 cm - Cabinet
Tagged: sulfide , copper , ore specimen

This specimen is from the Eskay Creek mine, a polymetallic deposit, in British Columbia. Once operated by Homestake and Barrick mining companies the mine produced 3.3 million ounces of gold and 160 million ounces of silver at average grades of 45 g/t gold and 2,224 g/t silver from 1994 -2008. It is now owned by Skeena Gold Company, who states: "Eskay Creek is renowned for being one of the highest-grade and lowest-cost open-pit precious metal mines globally. Additionally, estimated silver by-product production will surpass many primary silver mines". They are scheduled to be back online and mining in 2027. If you are seeking employment they are looking for all jobs from engineering to front office. Click here: https://skeenagoldsilver.com/eskay-creek/

This particular specimen is Bornite which carries values of 60-80 grams/ton Gold and 1700 grams/ton Silver.