The Flonheim-area is famous for its pseudomorphous chalcedonies. They are so called “scolecite-agates” - but not only this zeolithic mineral was transformed into chalcedony. The formation of the agates allows the interpretation that the minerals barite and calcite are replaced by chalcedony too.

Between this pseudomorphic formations fine banded and nicely coloured fortification-agate can be found too. Sometimes they are looking similar to the “Polyedric Agates” from Paraiba, Brazil. Beside the pseudomorphs agates-nodules and vein-agates are occuring in this region too. Silificied stromatholithes can be found too.