Recently Released Special Editions
Butte, Montana
Mineral Specimens from the Butte District in Montana. Read all about Butte mining history, geology and minerals.
Acanthite
- $75.00 - Sold
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- Locality
- Lexington Mine, Butte, Silver Bow Co., Montana, United States
- Availability
- Sold
- Size
- 8 x 9 x 6 cm - Sm Cabinet
- Tagged
- sulfide , ore specimen
The David New label for this specimen says that it was collected in 1905 by R. Mackay with detailed information on the exact locality which was the Chief Joseph vein, 400 ft level. It was collected from the Lexington mine, one of the premier early silver producers in Butte, according to Jenkins & Lorengo (Min. Record v. 33, n. 1 2002). The piece is a large ore specimen with several sulfides, all massive.
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
- Collection
- Phillips Collection
David New label
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- On Dakota Matrix
- Previously Sold Acanthite
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Baryte
- $95.00 $225.00 - Available
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- Locality
- Indian Head Rock, Basin, Jefferson Co., Montana, United States
- Formula
- BaSO4
- Availability
- Available
- Price
- $225.00
- Reduced Price
- $95.00
- Size
- 5 x 3 x 2 cm - Miniature
- Tagged
- sulfate
Although, this specimen was originally posted as coming from Butte, it has come to our attention by a well-known locality expert, that the locality is actually Indian Head Rock, not Butte. These mistakes happen every now and then. Our knowledge for many of these minerals in this Special Edition was based on the Butte Mineralogical Record issue from 2002. According to our expert, even they got it wrong. Although we are not entirely convinced, we will rely on our expert's opinion. If any of you have other opinions, please let us know. We would love to hear from you. Thick tabular golden Barite encrusted over with possible Anglesite. Althought the side is cleaved off, it gives the viewer the opportunity see the rich golden color. See page 62 of Jenkins & Lorengo (Min. Record v. 33, n. 1 2002) for comparison.
Baryte
- Formula
- BaSO4
- Crystal System
- Orthorhombic
- Crystal Habit
- Tabular, Prismatic, Massive - Fibrous
- Cleavage
- Perfect, Perfect, Imperfect
- Luster
- Vitreous (Glassy)
- Color
- white, yellowish white, grayish white, brownish white, dark brown
- Streak
- white
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Uneven
- Hardness
- 3-3.5
- Collection
- Phillips Collection
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- On Dakota Matrix
- Previously Sold Baryte
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Bornite
- $2,500.00 - Available
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- Locality
- Leonard mine, Silver Bow Co., Montana, United States
- Formula
- Cu5FeS4
- Availability
- Available
- Price
- $2,500.00
- Size
- 15 x 8 x 4.5 cm - Cabinet
- Tagged
- sulfide , ore specimen
A large plate of dull, dark blue to almost black Bornite crystals to over 2cm with the center piece showing Bornite perhaps encrusting or pseudomorphing Covellite or Chalcocite. Associate mineral include Pyrite and Quartz and tiny, prismatic Apatite crystals. This is an outstanding specimen and belongs in a museum or the home of a seasoned Butte collector.
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
- Phillips Collection
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- On Dakota Matrix
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Chalcocite
- $450.00 - Sold
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- Locality
- Mountain Consolidated Mine, Butte, Silver Bow Co., Montana, United States
- Formula
- Cu2S
- Availability
- Sold
- Size
- 7.5 x 6.5 x 4 cm - Sm Cabinet
- Tagged
- sulfide , ore specimen
Outstanding specimen with stell grey free-standing swords of Chalcocite to 9mm generally averaing 5mm. There is a slight iridescence of a blue tone. Very little damage to this specimen for being so old and historic.
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
- Phillips Collection
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- On Dakota Matrix
- Previously Sold Chalcocite
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Chalcopyrite
- $750.00 - Sold
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- Locality
- Leonard mine, Silver Bow Co., Montana, United States
- Formula
- Cu1+Fe3+S2
- Availability
- Sold
- Size
- 11 x 5.5 x 4 cm - Cabinet
- Tagged
- sulfide
Cabinet specimen with an iridescent coating of Chalcopyrite on/or a total replcement of tabular, 5 to 7mm Enargite. Very clean, damage free, outstanding specimen which naturally sits well.
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
- Collection
- Phillips Collection
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- On Dakota Matrix
- Previously Sold Chalcopyrite
- On Dakota Matrix
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