mineral

Tumbled yellow chalcedony (likely yellow jasper or silicified material)

Microcrystalline quartz, SiO₂; precise identification requires testing

AI-generated identification · may be incorrect

Cream-to-yellow, opaque, smoothly water-worn or tumbled, with a dull-to-waxy luster and no visible cleavage; quartz hardness is about 7 Mohs and specific gravity about 2.6. The surface shows cloudy granular mottling rather than distinct crystals.

Identified August 17, 2026More mineral →

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At a glance

Common name: Tumbled yellow chalcedony (likely yellow jasper or silicified material)
Scientific name: Microcrystalline quartz, SiO₂; precise identification requires testing
Category: mineral
Identified: August 17, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common tumbled pebble; $10–$30 if unusually attractive, patterned, or sold as a quality lapidary specimen.

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

Forms when silica-rich groundwater fills cavities or replaces volcanic or sedimentary material; the specimen is likely naturally rounded or human-tumbled. Its exact geological age and source cannot be determined from the image.

Uses & applications

Used as a lapidary stone, carving material, decorative pebble, and inexpensive jewelry component; typically valued mainly for appearance.

Geological facts

Yellow coloration commonly comes from iron oxides or hydroxides. A steel file should not easily scratch quartz-rich material, while glass can usually be scratched by it.

Field identification & locations

Common in silica-rich volcanic terrains, sedimentary deposits, and gravel beds worldwide; localities include Oregon, California, Brazil, India, and Madagascar. Confirm with a hardness test, streak (white), and absence of fizz in dilute acid.