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Discover the extraordinary beauty of these natural Rainbow Pyrite Fossil Specimens from Ulyanovsk, Ulyanovsk Oblast, Russia. Available as four unique collector variations, these rare fossils showcase an incredible iridescent metallic surface displaying vivid flashes of gold, blue, green, purple, and bronze tones formed naturally over millions of years. Unlike traditional Pyrite crystal specimens, Rainbow Pyrite from this locality is actually fossilised ancient marine material that has undergone pyritisation — a rare geological process where organic structures become replaced with iron sulphide minerals over time. This creates spectacular metallic fossil formations with shimmering rainbow iridescence that distinguish them from standard cubic Pyrite crystals commonly known as “Fool’s Gold.” These fascinating specimens originate from Jurassic marine deposits in Russia, where ancient ammonites and other prehistoric organic materials became mineralised under unique environmental conditio...