Flint

Flint is a mineral obtained from gravel.

Mining
When a block of gravel is mined, there is a 10% chance for a single piece of flint to drop instead of the gravel block. When mined with a Fortune-enchanted tool, this chance increases to 14% at Fortune I, 25% at Fortune II, and 100% at Fortune III. Gravel mined using a tool with Silk Touch or gravel that fell on a non-solid block never produces flint.

Trading
Novice-level Fletcher villagers have a 50% or $2/3$ chance to offer 10 pieces of flint for 10 blocks of gravel and an emerald.

Drops
When holding an Emerald in hand, some Fletcher villagers will hold flint. If holding, there is an 8.5% chance to drop 10 flint upon death by player. The percentage is increased by looting.

Trading
Apprentice-level fletcher villagers buy 26 flints for an emerald.

Apprentice-level leatherworker villagers have a $2/3$ chance to buy 26 flint for an emerald $$, and always offer the trade $$.

Journeyman-level toolsmith villagers have a 40% chance to buy 30 flints for one emerald in Java Edition and always offer the trade-in Bedrock Edition.

Journeyman-level weaponsmith villagers buy 24 flints for an emerald.