Pyrite replaces the original shell on this fossil ammonite showing that it was buried in sediments with lots of sulphur (S) and iron (Fe). Pyrite or "fool's gold" has the simple chemical formula of FeS. / Mineral Friends: Russia, Nature, Half

Pyrite replaces the original shell on this fossil ammonite showing that it was buried in sediments with lots of sulphur (S) and iron (Fe). Pyrite or "fool's gold" has the simple chemical formula of FeS. / Mineral Friends: Russia, Nature, Half

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