Moldavite glasses formed 15 million years ago during the impact of a giant meteorite in present-day Nördlinger Ries. Splatters of rocks that were melted by the impact cooled and most fell in south Bohemia – traversed by Vltava river, in German: Moldau, hence its name. They are a type of tektite and impactite. Although the event occurred in Germany, most specimens are found in Czech Republic due to the trajectory of the impact. This specimen is still on its original matrix.