Triboluminescence is an optical phenomenon in which light is generated via the breaking of asymmetrical bonds in a crystal when that material is scratched, crushed, or rubbed. This is a variant of luminescence; the term comes from the Greek tribein (to rub) and the Latin lumen (light).

Property exhibit in certain minerals which causes them to give off orange or yellow "flashes" when sawed or struck. Minerals with this property are triboluminescent.