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Bornite coating Pyrite with Quartz

#PD32432

Bornite coating Pyrite with Quartz

#PD32432
Availability
Sold
Size
5.5 x 4.5 x 1.5 cm - Sm Cabinet 
Formula
Cu5FeS4 (RRUFF)
Locality
Stewart mine, Butte, Silver Bow Co., Montana, United States
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.

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

Data courtesy of Webmineral.

Collection
Phillips Collection
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