Impactite

[1][2] Impactites are considered metamorphic rock, because their source materials were modified by the heat and pressure of the impact.

[3] On Earth, impactites consist primarily of modified terrestrial material, sometimes with pieces of the original meteorite.

[3] Only very massive impacts generate the heat and pressure needed to transform a rock, so impactites are created rarely.

When a meteor strikes a planet's surface, the energy released from the impact can melt rock and soil into a liquid.

[2] If the liquid cools and hardens quickly into a solid, impact glass forms before the atoms have time to arrange into a crystal lattice.