mineral

Tumbled yellow chalcedony (likely honey agate or yellow quartz)

Microcrystalline quartz, SiO₂; coloration likely from iron oxides or included minerals

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent yellow to honey-colored, waxy-to-glassy luster, cryptocrystalline structure, no visible cleavage, conchoidal fracture, specific gravity about 2.6. Its smooth rounded form indicates human tumbling and polishing.

Identified August 21, 2026More mineral →

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At a glance

Common name: Tumbled yellow chalcedony (likely honey agate or yellow quartz)
Scientific name: Microcrystalline quartz, SiO₂; coloration likely from iron oxides or included minerals
Category: mineral
Identified: August 21, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small tumbled piece; $20–$75 if unusually transparent, brightly colored, or attractively patterned.

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 deposits microscopic quartz fibers in cavities and fractures, commonly in volcanic rocks; iron staining produces yellow hues. Deposits range from relatively young volcanic terrains to Paleozoic and older sedimentary-hosted occurrences.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive jewelry; polished pieces are popular as lapidary and metaphysical specimens.

Geological facts

Chalcedony is quartz whose crystals are too fine to see individually; agate is a banded or patterned variety, so this specimen may simply be massive yellow chalcedony rather than true agate.

Field identification & locations

Identify by its waxy translucence, lack of cleavage, hardness, and conchoidal fracture; it should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, India, Madagascar, and the United States.