mineral

Chalcedony / milky quartz flake

Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment

AI-generated identification · may be incorrect

Cream to translucent white, waxy-to-dull luster, conchoidal fracture, no visible cleavage; quartz hardness about 7 Mohs and specific gravity about 2.60–2.65. The tapered, symmetrical form and flake scars suggest intentional knapping rather than a natural crystal.

Identified August 30, 2026More mineral →

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At a glance

Common name: Chalcedony / milky quartz flake
Scientific name: Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

$1–$15 as an ordinary quartz/chalcedony fragment; roughly $20–$200+ if confirmed as an authentic, well-preserved archaeological artifact with documented provenance.

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

Silica-rich groundwater formed chalcedony in cavities or fractures, commonly in volcanic or sedimentary rocks; the pictured piece appears human-worked, with age indeterminate. Around 43°N, 108°W, quartz/chert and silicified volcanic rocks are regionally plausible.

Uses & applications

Historically suitable for a stone tool or arrowhead; chalcedony is also used for beads, carvings, abrasives, and ornamental objects. A clear archaeological provenance can greatly increase value.

Geological facts

The pointed shape and bifacial-looking flaking may indicate a small lithic point or blade, but the image alone cannot establish whether it is prehistoric or recently made.

Field identification & locations

Inspect the edges for deliberate, repeated flake scars and a striking platform; natural breakage is usually less patterned. Common regional possibilities include chalcedony, jasper, and siliceous chert from Wyoming’s sedimentary and volcanic terrains; avoid damaging it if archaeological context is possible.