sedimentary

Chert Arrowhead (Flint Projectile Point)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: reddish-brown, tan, and brownish-pink. Luster: waxy to vitreous. Cleavage: none (exhibits prominent conchoidal fracture). Microcrystalline aggregate structure.

Hardness: 7 on Mohs scale
Color: reddish-brown, tan, and brownish-pink
Luster: waxy to vitreous

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 7 on Mohs scale. Color: reddish-brown, tan, and brownish-pink. Luster: waxy to vitreous. Cleavage: none (exhibits prominent conchoidal fracture). Microcrystalline aggregate structure.

Formation & geological history

Formed through biochemical and chemical precipitation of silica in marine environments, often replacing carbonate rocks (limestone or chalk). This piece was later knapped by humans into a functional tool or projectile point.

Uses & applications

Historically used as projectile points for hunting, weaponry, and cutting tools. Today, collected as archaeological artifacts, geological specimens, or educational display items.

Geological facts

Chert and flint were among the first materials used by early humans to make tools because of their ability to fracture predictably with sharp edges, a process known as flintknapping.

Field identification & locations

Identifiable by its sharp knapped edges, notched base, triangular profile, and smooth conchoidal fractures. Commonly found in limestone beds, stream beds, and archaeological sites.