Tektite

Tektite is a rock formed by the impact of an extraterrestrial body (meteorite) on the Earth's surface. During the impact, a huge amount of energy is released within a short period of time, which is converted into heat, resulting in metamorphic processes during which the original rocks are transformed into a new rock - tektite. Tektite has a predominantly glassy structure and can be compared to natural glass or obsidian.