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Recently Released Special Editions

Ore Minerals, part 1

Thursday, 13 July 2023 06:00 PM

A wide array of excellent, rich, and large ore minerals from classical mining districts.

SOLD
Bauxite - 62054
Bauxite - 62054

Bauxite

#62054
Locality
Les Baux-de-Provence, Alpes-Côte d'Azur, France 
Availability
Sold
Size
6 x 4.5 x 2 cm - Sm Cabinet 
Tagged
ore mineral  

Bauxite is the primary ore of aluminum. It is a mixture of two to three minerals including Diaspore, Bibbsite, and or Boehmite.  Bauxite is a secondary product resulting from the weathering, leaching, and alteration of aluminous rocks and minerals. Aluminum is the 3rd most abundant element in the Earth's crust.

This specimen consist of Diaspor and Boehmite, which has a pisolitic habit (rounded concreations).


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Bornite - AH59241
Bornite - AH59241

Bornite

#AH59241
Locality
Thunderbird mine, Ouray Co., Colorado, United States 
Formula
Cu5FeS4 
Availability
Sold
Size
7 x 7 x 4.5 cm - Sm Cabinet 
Tagged
ore mineral , sulfide , copper  

This specimen was collected by Arnold Hampson circa 1950's. I could not find the locality on Mindat. It is a chunk of metallic bluish grey to purple. Bornite is a sulfide or copper and iron and contains about 63% Cu and thus an important ore.


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
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Boulangerite - RW48879
Boulangerite - RW48879

Boulangerite

#RW48879
Locality
Cleveland mine, Stevens Co., Washington, United States 
Formula
Pb5Sb4S11 
Availability
Sold
Size
7.5 x 3.5 x 3 cm - Sm Cabinet 
Tagged
ore mineral  

Very thin slender crystals of Boulangerite in a compact fibrous mass.


Boulangerite

Formula
Pb5Sb4S11 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Massive - Fibrous, Plumose 
Cleavage
Indistinct, Indistinct, None 
Luster
Metallic 
Color
lead gray, blue gray, gray 
Streak
reddish brown 
Class
Orthorhombic 
Fracture
Brittle 
Hardness
2.5 
Collection
Robert J. Waidler Collection
Mineralpedia
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Chalcocite - RW51262
Chalcocite - RW51262

Chalcocite

#RW51262
Locality
Chino mine, Grant Co., New Mexico, United States 
Formula
Cu2S 
Availability
Sold
Size
6.5 x 8 x 4.5 cm - Sm Cabinet 
Tagged
ore mineral , sulfide , copper  

Chalcocite has a very distinct color when fresh. This is a split and thus the fresh color can be seen as a dull grey. When scratched with a knife, Chalcocite will show some sectility and is a little softer than Bornite. It is, also, not as brittle as Bornite. This is best seen under the microscope. When massive, like this specimen, a conchoidal fracture can be seen. The vein here is nearly 2cm thick. Chalcocite contains more copper than Bornite coming in at almost 80% and thus a major ore of copper. 


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
Robert J. Waidler Collection
Mineralpedia
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Chalcocite - RW51286
Chalcocite - RW51286

Chalcocite

#RW51286
Locality
Obojnigraben, Karawanken, Carinthia, Austria 
Formula
Cu2S 
Availability
Sold
Size
10 x 6 x 1 cm - Cabinet 
Tagged
ore mineral , sulfide , copper  

This is a slab of Chalcocite. The mineralization appears to have impregnated the host rock in very narrow veins.


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
Robert J. Waidler Collection
Mineralpedia
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Chalcocite - DL62072
Chalcocite - DL62072

Chalcocite

#DL62072
Locality
Ray mine, Pinal Co., Arizona, United States 
Formula
Cu2S 
Availability
Sold
Size
8 x 6 x 4 cm - Sm Cabinet 
Tagged
ore mineral , sulfide , copper  

A pure mass of grey Chalcocite. Collected by David London on the 900 ft level of the Ray mine and hauled up on a latter. I'm sure his pack was loaded!


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
Mineralpedia
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