Search Archived Mineral Specimens
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Nevada mine, Whetstone Mountains, Cochise Co., Arizona, United States
- Size
- Cabinet 13x3x9cm
This is a really neat specimen of banded Rhyolite with 2-5mm seams of platy blue crystalline Bornite. This piece actually gave us the idea for an Ore Specimen Special Edition and is just a really interesting piece!
Unfortunately I couldn't find any good resources on this particular mine, but I'm sure it's out there somewhere and I'd definitely be interested in the geologic processes that formed a mineralized banded Rhyolite like thi
- Availability
- Sold
May not be the most aesthetic (maybe pathetic) Bornite around, but has good provenance - a Geo. English label and a University of Chicago label. Shows nice iridescent 2-3mm crystals. Number on specimen matches labels.
- Availability
- Sold
- Locality
- Butte dist., Silver Bow Co., Montana, United States
- Formula
- Cu5FeS4
- Size
- SmCabinet 7x4x3cm
- Tagged
- sulfide , ore specimen
Large slightly iridescent Bornite crystal aggregate to 2cm with individual crystals to 1cm. The specimen shows how the quartz vein is mineralized and zoned from Pyrite on the fringes to copper bearing sulfide at the center with a large open cavity.
- Availability
- Sold
- Locality
- Mountain Consolidated mine, Butte, Silver Bow Co., Montana, United States
- Formula
- Cu5FeS4
- Size
- SmCabinet 6x6x3cm
- Tagged
- sulfide , ore specimen
Aesthetic specimen of Bornite matrix with flat-lying white Calcite crystals to 3cm. On the side you can see the clear definition of the ore vein as it penetrated the Butte quartz monzonite matrix.
- Availability
- Sold
- Locality
- Leonard mine, Butte dist., Silver Bow Co., Montana, United States
- Formula
- Cu5FeS4
- Size
- Cabinet 15x8x4.5cm
- 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.
- Availability
- Sold
- Locality
- Stewart mine, Butte, Silver Bow Co., Montana, United States
- Formula
- Cu5FeS4
- Size
- SmCabinet 5.5x4.5x1.5cm
- Tagged
- sulfide
An awesome specimen of iridescent Bornite coating octahedral Pyrite crystals to 1cm with micro crystals of Quartz. Look close at the photos, these are actually cubo-octahedral crystals. According to Jenkins & Lorengo (Min. Record v. 33, n. 1 2002), Pyrite is rather abundant at Butte but they also report octahedral crystals as rare in Main Stage veins. The Stewart is a Main stage Anaconda vein.
