sedimentary
Chert Arrowhead
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and cryptocrystalline structure. Colors range widely from white and grey to brown and tan.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and cryptocrystalline structure. Colors range widely from white and grey to brown and tan.
Formation & geological history
Formed via the chemical precipitation and replacement of silica in marine environments, often within limestone or chalk formations over millions of years.
Uses & applications
Historically used by indigenous peoples for tools and weaponry like projectile points and scrapers. Highly valued today as a collectible artifact.
Geological facts
Chert was the preferred material for primitive stone tools due to its ability to break with razor-sharp edges and predictable fracture patterns.
Field identification & locations
Identify by its waxy luster, sharp conchoidal edges, and high hardness capable of scratching glass. Commonly found worldwide near ancient settlement sites and flint-bearing limestone deposits.
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