mineral

Tumbled yellow chalcedony (likely honey agate or yellow jasper)

Microcrystalline quartz, SiO₂; precise identification is uncertain from the photograph

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent golden-yellow to brown, waxy-to-glassy luster, cryptocrystalline quartz with no visible cleavage. The smooth rounded shape indicates mechanical tumbling and polishing.

Identified August 20, 2026More mineral →

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At a glance

Common name: Tumbled yellow chalcedony (likely honey agate or yellow jasper)
Scientific name: Microcrystalline quartz, SiO₂; precise identification is uncertain from the photograph
Category: mineral
Identified: August 20, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a small tumbled piece; $20–$75 for larger, vividly colored, naturally patterned specimens.

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 deposited microcrystalline quartz in cavities or fractures, commonly associated with volcanic rocks; formation age varies by locality from Paleozoic to Cenozoic. Tumbling is modern human processing.

Uses & applications

Used for cabochons, beads, carvings, decor, and inexpensive gemstone specimens; it has little industrial value in this form.

Geological facts

Yellow coloration may come from iron oxides or hydroxides. Stronger translucency and banding would favor yellow agate; more opaque, uniform material would favor yellow jasper.

Field identification & locations

Common sources include Brazil, Madagascar, Uruguay, India, and the western United States. Field tests include glass-scratching hardness and examining translucency/banding; avoid confusing it with dyed quartz or resin.