mineral

Tumbled orange-and-white chalcedony (likely carnelian or orange agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-colored carnelian

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; waxy to vitreous luster, translucent orange and cream bands, cryptocrystalline quartz, no visible cleavage, specific gravity about 2.60. Its rounded shape and glossy surface indicate mechanical tumbling and polishing.

Identified September 13, 2026More mineral →

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At a glance

Common name: Tumbled orange-and-white chalcedony (likely carnelian or orange agate)
Scientific name: Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-colored carnelian
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $3–$15 for a common tumbled piece; $20–$75 if strongly banded, unusually translucent, or exceptionally 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

Silica-rich groundwater deposited microscopic quartz in cavities and fractures, with iron oxides producing the orange-red color; formation can range from Paleozoic to Cenozoic depending on source locality. The exact geological age cannot be determined from the image.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive collectible specimens; durable enough for some jewelry but less valuable than transparent gem quartz.

Geological facts

Carnelian is orange-red chalcedony, while agate generally shows distinct curved or parallel banding; this specimen appears weakly banded or color-zoned, so “orange chalcedony” is safest.

Field identification & locations

Common in volcanic-rock cavities and alluvial gravels, especially in Brazil, Uruguay, India, Madagascar, and the United States. Identify with its waxy translucence, hardness, conchoidal fracture, and lack of fizz in dilute acid; glass imitations may show bubbles.