sedimentary

Chert or jasper arrowhead flakes

Microcrystalline quartz (SiO₂), likely ferruginous red jasper/chert

AI-generated identification · may be incorrect

Opaque, reddish-brown to tan, dull-to-waxy luster, very fine-grained with conchoidal fracture and no visible cleavage; Mohs hardness about 6.5–7, specific gravity 2.6–2.7. The shapes appear intentionally knapped, possibly prehistoric or modern replicas.

Identified September 7, 2026More sedimentary →

Explore Chert or jasper arrowhead flakes in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

At a glance

Common name: Chert or jasper arrowhead flakes
Scientific name: Microcrystalline quartz (SiO₂), likely ferruginous red jasper/chert
Category: sedimentary
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Common knapped fragments or modern replicas: $5–$30 each; authenticated, well-preserved prehistoric artifacts with legal documented provenance may range from $50 to several hundred dollars.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Chert forms when silica-rich groundwater replaces or precipitates within sediment, commonly in limestone; iron oxides create the red color. Formation ages vary widely, from Paleozoic to younger deposits; working age cannot be determined from the image.

Uses & applications

Historically used for arrowheads, knives, scrapers, and fire-starting tools; today valued mainly as archaeological material, lapidary rough, or display specimens.

Geological facts

Sharp conchoidal edges and flake scars are characteristic of stone knapping. The central reddish piece may be jasper, while the tan pieces could be chert or silicified rock.

Field identification & locations

Identify by glass-like fracture, hardness, and inability to scratch it with a steel knife; chert commonly occurs as nodules or beds in limestone. Archaeological attribution requires provenience and expert examination.