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Tektites are natural glass objects, up to a few centimeters in size, which have been formed by the impact of large meteorites on Earth's surface. Tektites are among the "driest" rocks, with an average water content of 0.005%. This is very unusual, as most if not all of the craters where tektites may have formed were underwater before impact. Also, partially melted zircons have been discovered inside a handful of tektites. This, along with the water content, suggests that the tektites were formed under phenomenal temperature and pressure not normally found on the surface of the Earth.

As the impact theory states, tektites cannot be found everywhere on Earth's surface. They are only found in four strewnfields, three of which are associated with known impact craters.