sedimentary
Chert / Flint (Flaked Stone Tool / Projectile Point)
Microcrystalline Quartz (SiO2)
Hardness: 7 on Mohs scale. Color: Light gray, weathered patina. Luster: Waxy to dull. Crystal structure: Cryptocrystalline/microcrystalline quartz. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Light gray, weathered patina
- Luster
- Waxy to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Light gray, weathered patina. Luster: Waxy to dull. Crystal structure: Cryptocrystalline/microcrystalline quartz. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed via the chemical precipitation of silica in marine environments (such as chalk or limestone deposits) over millions of years. This specific specimen has been intentionally shaped by human knapping.
Uses & applications
Historically used by indigenous peoples and ancient humans for making tools, blades, and projectile points due to its sharp edges when fractured.
Geological facts
Chert and flint were vital materials for early human survival, used extensively for hunting, cutting, and starting fires (when struck against iron pyrite or steel).
Field identification & locations
Found in sedimentary rock formations worldwide, particularly limestone and chalk beds. Look for smooth, conchoidal fracture patterns and evidence of human retouching or percussion flaking along the edges.
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