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Bornite with Malachite, Allanite(?)

#BM40466

Bornite with Malachite, Allanite(?)

#BM40466
Availability
Sold
Size
9 x 7 x 4 cm - Sm Cabinet 
Formula
Cu5FeS4 (RRUFF)
Locality
Tennant Creek, Tennant Inlier, Northern Territory, Australia
Tagged
sulfide , copper

Here's an old specimen which has been passed down through the ages as a misidentified Atacamite (See prov. tab with three old labels). I was suspicious after I took the photos and saw the acicular crystals, which is not a typical habit of Atacamite. Sure enough the HCl fizz test proved to be Malachite. The Mindat locality list doesn't include Atacamite from this locality, but does include Malachite, which is one of the few secondary minerals from this locality. The Bornite occurs as veinlets 1- 4mm wide or long in a siliceous hematite or Tenorite matrix. I found one small black, tabular crystal about 1mm in size which may be the 'allanite' on the Mindat list. I didn't see any evidence of the type locality minerals Proudite or Pekoite, the bismuth - selenium minerals. It's a neat specimen originally in the Don Phillips collection and obtained by McConlogue prior to me getting Phillip's collection.

Antique Specimen

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
McConlogue Collection
Special Info
Antique Specimen
Mineralpedia
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Previously Sold Bornite
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WebMineral
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Mindat
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