'Chalcopyrite from Butte, Montana'

'Chalcopyrite from Butte, Montana'

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: Chalcopyrite, copper iron sulfide, is one of the most widespread and important ores of copper. It occurs both as disseminated grains in a host rock, and also in vein-type deposits along with pyrite, galena, sphalerite and other sulfide minerals. Chalcopyrite has a golden yellow color, but the surface tarnishes rapidly upon exposure to air leaving a characteristic brightly colored iridescent film. The material from Butte, Montana shows off this property very well.

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Keywords: arem collection, chalcopyrite, crystal, crystals, galena, geology, iridescence, iridescent, metallic, mineral, mineralogy, minerals, nature, object, ores, pyrite, specimen, specimens, sphalerite, still life, sulfide, tarnish, vein deposits, veins

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