Rainbow iridescent lustrous Chalcopyrite crystals on matrix from Brushy Creek Mine, Greeley, Reynolds County, Missouri, USA. A vibrant and highly lustrous specimen from the renowned Brushy Creek Mine, featuring sharply crystallized chalcopyrite exhibiting captivating rainbow iridescence. The chalcopyrite crystals display a spectrum of gold, blue, and purple hues as light plays across their metallic surfaces, offering dramatic visual appeal and dynamic color contrast. Brushy Creek Mine is celebrated for producing classic sulfide mineral combinations, with its rainbow-colored chalcopyrite being especially prized by collectors for both its flash and locality. This piece exemplifies the mine’s mineralogical beauty and makes a superb addition for those seeking distinctive American display minerals or exceptional sulfide crystal specimens.