sedimentary
Chert / Flint Arrowheads and Artifacts
Cryptocrystalline quartz (SiO2)
Hardness of 7 on the Mohs scale; variable colors including gray, tan, brown, and white; waxy to vitreous luster; microcrystalline or cryptocrystalline structure; conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale; variable colors including gray, tan, brown, and white; waxy to vitreous luster; microcrystalline or cryptocrystalline structure; conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich solutions over geological timescales (millions of years), typically in marine sedimentary environments.
Uses & applications
Historically used by indigenous peoples for tools, weapons, and projectile points (arrowheads); highly prized by artifact collectors and archaeologists today.
Geological facts
Chert and flint were essential survival materials for early humans globally, prized for their ability to be knapped into extremely sharp edges and points.
Field identification & locations
Identified by conchoidal fracture patterns, sharp flaked edges, and human-modified notches or stems. Found worldwide near ancient settlement sites, agricultural fields, and river terraces.
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