Staff member
Jun 3, 2020
Bornite is a sulfide mineral with a chemical composition Cu5FeS4. Bornite has a brown to copper-red color on fresh surfaces that tarnishes to iridescent shades of blue, purple, red, green and yellow. It is easily recognized due to this property and is commonly called as peacock ore or peacock copper or purple copper ore. It occurs in igneous, metamorphic, and sedimentary rocks.

Bornite is an important copper ore with minable concentrations in sulfide mineral deposits, hydrothermal veins, and contact metamorphic zones. Several other sulfide minerals like Chalcopyrite, pyrite, and marcasite are commonly associated with bornite. It will weather to chalcocite upon surface exposure. Apart from being a copper ore, Bornite is also popular as a miineral specimen at museums and mineral shows due to its attractive colors.

Physical Properties

Crystal SystemOrthorhombic
ColorCopper red, bronze brown, purple.
StreakGrayish black
LusterSubmetallic to metallic
Mohs Scale Hardness3–3.25
Specific Gravity5 to 5.1
Chemical CompositionCu5FeS4
Diagnostic PropertiesColor, iridescence, lower hardness for a metallic mineral


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