Pyritized ammonite

Russia
The beauty of geochemistry
The fool’s gold Fast burial in oceanic sediments with low organic content. Pyritized fossil tell us a lot of things about their fossilization process and the prehistoric environment of our planet. Pyrite is an iron sulfur that occasionally – in unique geochemical conditions – covers or substitutes the prehistoric creatures, transforming them in unbelievable fossils with a sheen similar to gold.