Bornite (Cu2FeS4)
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
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colour
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Reddish bronze, tarnishes to blue, green and purple |
hardness
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3
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Crystal system
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Isometric
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Crystal habit
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Crystals rare but rough
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Lustre
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Metallic
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Streak
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Grey-black
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Fracture
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Conchoidal
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Other characteristics
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Tarnishes in hours.
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