mineral

Tumbled amber-colored chalcedony (likely carnelian or yellow agate)

Microcrystalline quartz, SiO₂; likely iron-bearing chalcedony

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent honey-yellow to orange-brown, waxy to vitreous luster, cryptocrystalline quartz with no visible cleavage. The smooth, glossy surface indicates tumbling or polishing.

Identified September 15, 2026More mineral →

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At a glance

Common name: Tumbled amber-colored chalcedony (likely carnelian or yellow agate)
Scientific name: Microcrystalline quartz, SiO₂; likely iron-bearing chalcedony
Category: mineral
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled stone; $20–$75 for unusually translucent, well-colored, or attractive polished material.

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

Forms when silica-rich groundwater fills cavities and fractures, with iron impurities producing yellow, orange, or red coloration; commonly Cenozoic to older volcanic-hosted deposits.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and inexpensive jewelry; also collected as an ornamental gemstone.

Geological facts

Carnelian is typically orange-red, while yellow varieties are often sold as yellow agate or citrine-colored chalcedony. Heat treatment can intensify orange coloration.

Field identification & locations

Identify by its fine-grained, glassy/waxy appearance, lack of cleavage, and ability to scratch ordinary glass; chalcedony feels cooler and harder than plastic or resin. Common sources include Brazil, India, Uruguay, Madagascar, and the United States.