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An important ore of copper composed of a mixed copper-iron sulphide, Cu5FeS4. Freshly exposed surfaces of the mineral are a metallic reddish-brown but a purplish iridescent tarnish soon develops – hence it is popularly known as peacock ore. Bornite is mined in Chile, Peru, Bolivia, Mexico, and the USA.

Subjects: Earth Sciences and Geography — Chemistry.

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