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| Symbol | SiO₂ |
|---|
This is a short overview. For the background — history, value over time and notable mines — see Flint →
A hard, fine-grained form of silica, found as nodules within chalk and worked since prehistory by knapping it into sharp-edged tools, and later gunflints. Valued for millennia for its ability to be flaked into a durable cutting edge, long before metal tools existed.
| Mine | Region | Worked |
|---|---|---|
| Blackpatch Flint Mines | West Sussex | from c. 3000 BC |
| Brandon Flint Mines | Suffolk | c. 4000 BC–1930s |
| Chislehurst Caves | Kent | at least the 13th century–1830s-40s |
| Church Hill Flint Mines | West Sussex | from c. 4300 BC |
| Cissbury Flint Mines | West Sussex | from c. 3700 BC |
| Emmer Green (Hanover) Chalk Mine | Berkshire | — |
| Grime's Graves | Norfolk | c. 2600 BC–c. 2400 BC or c. 2100 BC |
| Harrow Hill Flint Mines | West Sussex | from c. 3710 BC |
| Norwich Chalk Mines | Norfolk | 11th century–19th century |
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