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Exceptional chalcopyrite specimen from Chihuahua, Mexico, showcasing the stunning iridescent tarnish that makes this mineral truly captivating. This piece displays brilliant flashes of blue, green, and purple across its surface—the result of natural oxidation that creates a peacock-like patina. The brassy-yellow base contrasts beautifully with these vibrant color shifts, making it a standout addition to any mineral collection. Highly sought after by collectors who appreciate the dynamic interplay of colors found in premium Mexican chalcopyrite.