sedimentary

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: Tan, grey, or translucent white; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 Mohs
Color: Tan, grey, or translucent white
Luster: Waxy to dull

Identified March 28, 2026More sedimentary →

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Physical properties

Hardness: 7 Mohs; Color: Tan, grey, or translucent white; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the accumulation of silica-rich organic remains or chemical precipitation in sedimentary basins; primarily Paleozoic to Mesozoic era material. This specimen was anthropogenically modified through knapping.

Uses & applications

Historically used for hunting (projectile points/tools); currently sought for archeological study, historical collection, and as decorative artifacts.

Geological facts

Chert was preferred by prehistoric humans because it breaks into razor-sharp edges thanks to its conchoidal fracture. This specific point appears to be a bifacial lithic tool, likely a projectile tip or small scraper.

Field identification & locations

Identify in the field by looking for 'flake scars' (ripples from pressure flaking) and its distinct notched shape. Often found in tilled fields, near riverbeds, or sites of historical indigenous settlement.