mineral
Chalcedony (likely prehistoric flaked point)
Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material
AI-generated identification · may be incorrectPale 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.
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Physical properties
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.
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.
