Thread:HerobrineAC0318/@comment-26335978-20170508011313/@comment-26335978-20170508013535

Try it yourself, mine a piece of gravel until it it drops flint, the gravel will disappear. Try trading for it too, you will need 10 gravel and an emerald for 6-10 flint.

Also, Gamepedia's page on flint: http://minecraft.gamepedia.com/Flint