Piezoelectric Spark Generator.

Piezoelectric spark generators create electricity when PZT (Quarts crystal) is deformed by the sudden hit of a hammer on rails.
The generators can be found in thumb-friendly lighters, BBQ lighters, built-in BBQ igniters and other spark ignition systems.

Wiki page:

Big thanks to Tanya for letting me salvage her empty lighter…FOR SCIENCE!

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