mineral

Tumbled yellow chalcedony (likely citrine or yellow jasper)

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs, waxy to vitreous luster, translucent yellow coloration, and no visible cleavage; the color may come from iron staining or inclusions. Its smooth rounded form indicates tumbling or natural water wear.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled yellow chalcedony (likely citrine or yellow jasper)
Scientific name: Microcrystalline quartz, SiO₂; exact identification is uncertain from the photograph
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$75 if it is confirmed natural, unusually translucent, or well-colored.

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 fluids fill cavities and fractures, commonly in volcanic rocks; yellow varieties develop through iron impurities or alteration. Formation ages vary widely, from Cenozoic to much older deposits.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive jewelry; attractive pieces are collected as lapidary stones.

Geological facts

The specimen could also be yellow calcite, resin, or dyed quartz; hardness and an acid test would help distinguish them. Quartz does not effervesce in dilute hydrochloric acid.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, India, and the western United States. Test with a steel file or glass cautiously: quartz should scratch glass, while calcite will not and has much softer cleavage.