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Butte, Montana Mineral Specimens

Wednesday, 28 March 2012 03:00 PM

Mineral Specimens from the Butte District in Montana. Read all about Butte mining history, geology and minerals.

Covellite

coated with Chalcopyrite with Pyrite - #PD31832
Locality
Stewart mine, Butte, Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
9 x 6.5 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Excellent specimen with large Pyrite crystals to 1cm averaging 6mm. Along the center of this specimen are what I believe are Covellite crystals to 1cm coated with or replaced by iridescent blue to green Chalcopyrite. Originally labeled as Wurtzite with Pyrite, however, I do not see any evidence of this mineral.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Phillips Collection
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Covellite

#PD32429
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
5 x 5 x 4 cm - Miniature 
Tagged
sulfide , ore specimen  

A solid mass of foliated, purplish-blue Covellite.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Phillips Collection
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Covellite

#PD31038
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
8 x 5 x 3.5 cm - Sm Cabinet 
Tagged
sulfide  

A well-preserved Covellite specimen showing excellent platy iridescent purple crystals to 1.5cm. The side view of this mineral shows the contact of the copper vein mineralization with the wall rock.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Phillips Collection
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Djurleite

on Covellite - #PD31835
Locality
Leonard mine, Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu31S16 
Availability
Sold
Size
5 x 3 x 3 cm - Miniature 
Tagged
sulfide , ore specimen  

An interesting specimeng showing a trail of paragenesis from Pyrite to Covellite to Djurleite to Chalcocite. The Djurleite lines the large open vug with dozens of tiny, well-formed twinned Chalcocite crystals sprinkled about.


Djurleite

Formula
Cu31S16 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Tabular, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, blue black, black, black gray 
Streak
metallic 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Phillips Collection

Djurleite

#PD31455
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu31S16 
Availability
Sold
Size
3.5 x 2 x 2 cm - Miniature 
Tagged
sulfide  

A superb specimen of Djurleite with iridescent blue crystals to 5mm.


Djurleite

Formula
Cu31S16 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Tabular, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, blue black, black, black gray 
Streak
metallic 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Phillips Collection

Enargite

with Chalcocite & Gypsum var. selenite - #PD32434
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu3AsS4 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 
Tagged
sulfide  

Highly lustrous, reflective and brilliant short prismatic Enargite crystals to 3mm throughout this specimen with nice micro clear selenite crystals. According to Jenkins & Lorengo (Min. Record v. 33, n. 1 2002) Enargite was a fairly common mineral in the central and intermediate zones at Butte and accounted for nearly 20 to 40% of the underground ore production.


Enargite

Formula
Cu3AsS4 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Massive - Granular, Prismatic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Metallic 
Color
steel gray, blackish gray, violet black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
Collection
Phillips Collection
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