Bornite is a sulfidemineral with chemical composition Cu5FeS4 that crystallizes in the cubic system. It has a brown to copper-red color on fresh surfaces that tarnishes to an iridescent purple surface. Its purple to bronze iridescence gives it the nickname peacock ore. Bornite is an important copper ore mineral and occurs widely in porphyry copper deposits along with the more common chalcopyrite. Chalcopyrite will weather to produce bornite. Bornite is also found in pegmatites. It is important for its copper content of about 63 percent by mass and is found in Arizona, Butte, Montana, and Mexico. Image File history File links Bornite Source File links The following pages link to this file: Bornite ... Image File history File links Bornite Source File links The following pages link to this file: Bornite ... Image File history File links Kusový bornit locality: Slovakia: Malužiná, NÃzke Tatry sk: Slovensky: bornit Cu5FeS4 Source: http://www. ... Image File history File links Kusový bornit locality: Slovakia: Malužiná, NÃzke Tatry sk: Slovensky: bornit Cu5FeS4 Source: http://www. ... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. ... Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic brown Atomic mass 63. ... Jump to: navigation, search State nickname: The Grand Canyon State, The Copper State Other U.S. States Capital Phoenix Largest city Phoenix Governor Janet Napolitano (D) Senators John McCain (R) Jon Kyl (R) Official languages English Only State Area 295,254 km² (6th) - Land 294,312 km² - Water 942 km... Butte, Montana Butte is a city that is located in Silver Bow County, Montana and is the county seat. ...
The colors are from an iridescent tarnish that forms on bornite upon exposure to air.
Because bornite is often intergrown with chalcopyrite which tarnishes to more greens and yellows, the peacock ore may have many colors ranging from purple to blue to green to yellow.
Bornite is only isometric at temperatures above 228 degrees celsius and it was above this temperature that the crystals formed.
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