mineral

Tumbled yellow chalcedony (likely citrine-like quartz or yellow jasper)

Microcrystalline quartz, SiO₂; exact identification requires testing

AI-generated identification · may be incorrect

Honey-yellow, translucent to opaque, waxy-to-glassy luster, irregular internal pattern, and no visible cleavage; Mohs hardness about 6.5–7, specific gravity ~2.6. The smoothly rounded shape indicates tumbling or polishing.

Identified August 19, 2026More mineral →

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At a glance

Common name: Tumbled yellow chalcedony (likely citrine-like quartz or yellow jasper)
Scientific name: Microcrystalline quartz, SiO₂; exact identification requires testing
Category: mineral
Identified: August 19, 2026
Method: Standard

AI Estimated Value

Typically $3–$20 for a small tumbled specimen; approximately $20–$75 if unusually translucent, attractive, or sold as a quality cabochon.

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

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; yellow color may result from iron staining or inclusions. The specimen’s geological age cannot be determined visually and depends on its host deposit.

Uses & applications

Used as a low-cost lapidary stone, cabochon, carving material, and decorative collectible; it is not typically used as a major construction aggregate.

Geological facts

Yellow chalcedony, yellow jasper, heat-treated amethyst, and dyed quartz can look similar. Strong translucency and conchoidal fracture favor chalcedony, while an opaque, earthy appearance favors jasper.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, India, and the United States. Check hardness against glass, inspect translucency, and use a specific-gravity or gemological test; avoid destructive tests on polished pieces.