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Goethite

Chalcopyrite

Mineral Identification

Amethyst

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Bornite (Cu2FeS4)

bornite mineral specimen

The Peacock copper.

Bornite is another copper ore like Chalcopyrite,  it is often known as 'peacock copper' because its surface is often coated with a dark greeny, blue, purple iridescent tarnish.  It occurs as a primary deposit of many copper lodes. In Cornish mines it was known as 'horse-flesh' ore, because it has is pink copper colour. 

Data Panel: Iron Sulphide: Copper ore: Bornite
Cu2FeS4  Copper iron sulphide
colour

Reddish bronze, tarnishes to blue, green and purple

hardness
3
Crystal system
Isometric
Crystal habit
Crystals rare but rough
Lustre
Metallic
Streak
Grey-black
Fracture
Conchoidal
Other characteristics
Tarnishes in hours.

 

 Photograph reproduced with the kind permission of the Geevor Archive

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