sedimentary

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs scale; Color: Reddish-brown with tan inclusions; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).

Hardness: 7 Mohs scale
Color: Reddish-brown with tan inclusions
Luster: Waxy to vitreous

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 7 Mohs scale; Color: Reddish-brown with tan inclusions; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed via the accumulation of siliceous remains of marine organisms or through chemical precipitation in limestone/dolomite. This specimen was anthropogenically worked into an arrowhead.

Uses & applications

Historically used as a projectile point for hunting; today it serves as a valuable archaeological artifact and collector's item.

Geological facts

Chert and flint were preferred by prehistoric peoples worldwide because they break with extremely sharp edges through a process known as knapping.

Field identification & locations

Identified by its triangular shape, flaked edges (scars from pressure flaking), and conchoidal fracture patterns. Found in archaeological sites and riverbeds in limestone-rich areas.