mineral

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

Microcrystalline quartz, SiO₂; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent honey-yellow body, vitreous-to-waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded, glossy surface indicates tumbling or polishing; the dark spot may be an inclusion or surface pit.

Identified September 15, 2026More mineral →

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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. Its age depends on the host deposit, commonly Cenozoic to older.

Uses & applications

Used for cabochons, beads, carvings, and decorative stones; ordinary pieces have modest value.

Geological facts

It may be sold commercially as yellow chalcedony, honey agate, yellow jasper, or occasionally “citrine,” although true citrine has larger crystalline quartz structure. A refractive-index, specific-gravity, or microscopic test is needed for confident identification.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, India, and the western United States. Look for waxy luster, curved fracture, and hardness sufficient to scratch glass; value is typically $2–$15 for a small tumbled stone, or $20–$100+ for attractive cabochons.