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Bornite with Pyrite and Apatite

#45865

Bornite with Pyrite and Apatite

#45865
Availability
Sold
Size
10 x 9 x 5 cm - Cabinet 
Formula
Cu5FeS4 (RRUFF)
Locality
Butte dist., Silver Bow Co., Montana, United States
Tagged
sulfide , copper

A superb cabinet specimen with large Bornite crystals to 2.5cm. The crystals, for the species and the locality, are quite distinct but rounded and is typical of Butte. Large Bornite crystals such as these are found in very few places in the world. Butte and Dzhezkazgan mine in Kazakhstan are perhaps the largest. Bristol and Cornwall produced probably the best defined crystals. Butte is still one the most sought after localities for Bornite crystals.

Amongst the Bornite crystals are tiny blue Fluorapatite crystals. Pyrite is also present.

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
Chris van Laer Collection
Mineralpedia
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