Flint

Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Flint was widely used historically to make stone tools and start fires.

Composition

Flint is a form of silica composed primarily of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide. It is a hard, tough chemical or biochemical sedimentary rock that breaks with a conchoidal fracture. This makes it useful for tools and weapons.

Uses

Flint has been used since prehistoric times by humans to make tools. The Stone Age is named after this use of flint and other hard rocks to make tools for hunting and other purposes. Flint was also used to produce sparks to start a fire when struck by steel.

Health Effects

Inhaling flint dust can cause silicosis, a serious respiratory disease. It can also irritate the eyes and skin.

See Also

• Chert
• Quartz
• Silica
• Stone Age
• Silicosis

Flint Resources
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