Suevite

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Suevite is an impact breccia composed of angular fragments of different rock types as well as glass inclusions, set in a fine-grained matrix. This type of rock was first recognized at the Ries impact structure in Germany. In the suevite photos below, you can see lots of black glassy fragments (generally smoother than typical rock fragments) and white speckled crystalline fragments. The glasses are derived from rocks that were heated to such high temperatures during the impact event that they melted and then cooled very rapidly (quenched) to form glass. If a melt cools slowly, it can form an impact melt rock. Suevites at the Ries impact structure form the crater-fill deposits and are also found in the ejecta blanket.

See suevites in a quarry within the Ries impact structure