mineral

Tumbled chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; reddish varieties are carnelian, while more opaque material may be jasper

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; reddish-brown, gray, and cream coloration with a waxy to dull luster, cryptocrystalline structure, and no visible cleavage. The rounded shape and surface wear indicate tumbling or natural abrasion.

Identified August 31, 2026More mineral →

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At a glance

Common name: Tumbled chalcedony (likely carnelian or jasper)
Scientific name: Microcrystalline quartz, SiO₂; reddish varieties are carnelian, while more opaque material may be jasper
Category: mineral
Identified: August 31, 2026
Method: Standard

AI Estimated Value

About $2–$15 as a common tumbled stone; attractive polished or well-patterned specimens may sell for $20–$75.

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 in volcanic rocks, precipitating microscopic quartz fibers; iron produces the red-brown color. Deposits range from Paleozoic to recent, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, decorative stone, and lapidary practice; jasper is also used for ornamental objects and aggregate.

Geological facts

Chalcedony is quartz whose crystals are too small to see unaided; carnelian is its translucent orange-red variety, while jasper is generally opaque because of impurities.

Field identification & locations

Identify by its glass-scratching hardness, waxy surface, lack of cleavage, and mottled or semitranslucent appearance. Common sources include Brazil, India, Uruguay, Madagascar, and the western United States.