Tektites

An interesting characteristic of impact craters is the presence of tektites, smooth glass-like stones with size that range from a few centimeter to microscopic. Some of these stones have drop-like shapes showing to have been shaped by aerodynamic forces.Tektites are stones that show clear signs of having been heated twice: the first heating process seems to have melted the entire rock to molten state, while the second heating seems to have only affected the outer layers. For this reason, tektites are believed to be formed during impacts: first, the rock hit by the impactor has been melted, then ejected into the atmosphere, where, cooling off, it has taken its regular shape. The second heating process can be produced by friction, as the stones fall back to Earth.



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