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Gray, black, brown, red, ...
6½ - 7
Technically a rock, not a mineral, being composed largely of tiny grains of quartz or chalcedony. It is usually rather pure, with few other minerals involved, often dark. The term is sometimes used synonymously for chert, sometimes as a type of of chert (being a chert concretion).
The flint nodules and irregular layers found in limestones and marls are chert concretions.

Used to manufacture stone tools in prehistoric times.

Classification of Flint URL:
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Physical Properties of Flint

Waxy, Dull
Diaphaneity (Transparency):
Translucent, Opaque
takes good polish, then vitreous luster
Gray, black, brown, red, white and other colors due to staining
Hardness (Mohs):
6½ - 7
None Observed
Splintery, Conchoidal, Sub-Conchoidal

Other Names for Flint

Name in Other Languages:
Japanese:燧 石
Simplified Chinese:燧石

Other Information

Health Risks:
Quartz is usually quite harmless unless broken or powdered. Flint may have razor-sharp edges that can easily cut skin and flesh. Handle with care. Do not grind dry since long-term exposure to finely ground powder may lead to silicosis.

Internet Links for Flint

Localities for Flint

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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