sedimentary

Chert Arrowhead / Prehistoric Artifact

Cryptocrystalline Quartz (SiO2) - Artifact

Hardness: 7 on the Mohs scale. Color: White to grey with mottled patterns. Luster: Vitreous to dull. Crystal structure: Microcrystalline or cryptocrystalline quartz. Cleavage: None, exhibits conchoidal fracture.

Hardness: 7 on the Mohs scale
Color: White to grey with mottled patterns
Luster: Vitreous to dull

Identified August 1, 2026More sedimentary →

Explore Chert Arrowhead / Prehistoric Artifact in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in sedimentary environments through the replacement of limestone or chalk by silica-rich groundwater. Subsequently shaped by human craftsmanship (knapping) into a prehistoric tool during various archaeological periods.

Uses & applications

Historical and archaeological artifact, used historically by indigenous peoples for hunting and cutting tools, and collected today as an archaeological specimen.

Geological facts

Chert (often called flint) was favored by ancient humans worldwide for stone tool making due to its predictable conchoidal fracture, allowing precise control when chipping edges.

Field identification & locations

Identified by its waxy luster, conchoidal fracture lines, and human-modified edge flaking. Found globally in areas with historic indigenous activity, particularly near limestone formations.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary