Ferrocerium is a man-made metallic material that produces sparks reaching 3,000°C when scraped against a rough surface. Commonly referred to as “flint,” it bears no chemical resemblance to naturally occurring flint mineral once used for the same purpose. When scraped on a piece of steel, tiny pieces of flint are shaved off and ignited by the heat generated by friction. This produces the shower of sparks that can be used to start a fire.
Source: https://youtu.be/qO9g1_BTz0o (The Slow Mo Guys)
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