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Bornite with Quartz

#PD31834
SOLD
BORNITE from Butte dist., Silver Bow Co., Montana, United States - PD31834
BORNITE from Butte dist., Silver Bow Co., Montana, United States - PD31834

Bornite with Quartz

#PD31834
Availability
Sold
Size
7 x 4 x 3 cm - Sm Cabinet 
Formula
Cu5FeS4 (RRUFF)
Locality
Butte dist., Silver Bow Co., Montana, United States
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.

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 

Data courtesy of Webmineral.

Collection
Phillips Collection
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