mineral

Chalcedony (likely prehistoric flaked point)

Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material

AI-generated identification · may be incorrect

Pale green to yellow, translucent to opaque, with waxy-to-dull luster and no visible crystal faces; Mohs hardness about 6.5–7, conchoidal fracture, and specific gravity near 2.6. The sharp edges, intentional notches, and flaking indicate a worked stone point rather than a natural crystal.

Identified September 20, 2026More mineral →

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At a glance

Common name: Chalcedony (likely prehistoric flaked point)
Scientific name: Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material
Category: mineral
Identified: September 20, 2026
Method: Standard

AI Estimated Value

Common modern knapped reproduction: $10–$50; authenticated archaeological artifact with legal provenance: roughly $100–$2,000+, depending on age, culture, condition, and documentation.

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

Formed when silica-rich groundwater filled cavities or replaced material in volcanic or sedimentary rocks, generally during the Cenozoic or earlier; the point was later shaped by prehistoric knapping. Exact age cannot be determined from the image.

Uses & applications

Historically used as a cutting or projectile tool; today it may have archaeological, educational, or collectible value. It is not typically used as gem-quality jewelry material in this worked form.

Geological facts

The basal notches and bifacial-looking edge work are characteristic of a notched lithic point, but cultural attribution requires measurements, provenance, and expert examination.

Field identification & locations

Common source materials include chalcedony, chert, jasper, and silicified tuff; field identification relies on glassy/conchoidal fracture, hardness, and lack of cleavage. Avoid cleaning or altering it, as provenance strongly affects archaeological significance.