Flint Does Not Spark on Its Own
Flint is a hard stone that strikes sparks. The sparks are actually burning steel, not stone, shaved off by the flint's edge.
Flint is a hard grey form of quartz that fractures into sharp edges. The famous sparks come from the steel, not the stone: flint is hard enough to shave off tiny curls of iron, and those fragments are so small that they ignite in air and burn brightly. Striking two flints together produces almost nothing. The same hardness made flint the material of choice for Stone Age tools, because it breaks with a predictable conchoidal fracture.
- A hard stone. *A flint arrowhead.*
- A lighter part. *A lighter flint.*
- Flintlock — an early firearm. *A flintlock musket.*
- Flinty — hard and unyielding. *A flinty stare.*
- Knapping — shaping flint. *Flint knapping.*
Word forms
| Form | Word | Example |
|---|---|---|
| Noun | flint | A piece of flint. |
| Plural | flints | Sharp flints. |
| Adjective | flinty | Flinty soil. |
| Compound | flintlock | A flintlock. |
| Old English | flint | Flint. |
- The church walls are built of flint.Building.
- Flint and steel make sparks.Fire-making.
- The sparks are burning steel.Correction.
Why flint made good tools
- Conchoidal fracture — it breaks in smooth curved shells, not randomly
- Predictable edges — a knapper can control the shape
- Extremely sharp — a fresh flint edge rivals a scalpel
- Widely available in chalk deposits across Europe
- Knapping — the craft of shaping it, still practised
Old English *flint*, from a Germanic root, related to Greek *plinthos*, a brick or tile.
Does flint make the spark?
No. The flint shaves tiny fragments off the steel, and those fragments burn in air. The light comes from the steel.
Why was flint used for tools?
It fractures in smooth predictable curves, so a skilled knapper can produce extremely sharp controlled edges.