Rare pliosaur bone specimen featuring striking pyrite replacement, transforming the original fossil into a glittering mineral matrix. Sourced from the Volga River region in Ulyanovsk, Russia—a prolific site for marine reptile remains. This 8 × 1.5 × 6 cm piece showcases the interplay between paleontology and mineralogy, making it a compelling addition to any serious fossil or mineral collection. Each specimen is unique, reflecting millions of years of geological transformation.
