mineral

Tumbled chalcedony (likely carnelian or yellow jasper)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony/jasper

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; cream, honey-yellow, orange, and reddish-brown mottling; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage, conchoidal fracture, and typical specific gravity near 2.6. The rounded, glossy surface indicates tumbling and polishing.

Identified September 15, 2026More mineral →

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At a glance

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

AI Estimated Value

Approximately $2–$15 for a common tumbled piece; $20–$75+ for unusually attractive, strongly patterned, or locally collectible 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

Silica-rich groundwater deposited microcrystalline quartz in cavities or fractures, with iron oxides producing the warm colors; such material commonly formed in volcanic rocks during the Cenozoic or earlier. The exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, decorative objects, and inexpensive jewelry; jasper and chalcedony are also used as ornamental stone.

Geological facts

Color variation reflects hematite/goethite staining; translucent edges would favor chalcedony or carnelian, while opaque areas favor jasper.

Field identification & locations

Identify with a glass-scratching test, absence of cleavage, waxy luster, and iron-rich banding or patches; common sources include Brazil, India, Madagascar, Uruguay, and the western United States.