gemstone

Tumbled orange chalcedony (likely carnelian)

Cryptocrystalline quartz, SiO₂; carnelian is orange-red chalcedony colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, vitreous to waxy luster, translucent orange to reddish-orange color, and no visible cleavage; its microcrystalline quartz structure gives a smooth, tough surface.

Identified August 8, 2026More gemstone →

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At a glance

Common name: Tumbled orange chalcedony (likely carnelian)
Scientific name: Cryptocrystalline quartz, SiO₂; carnelian is orange-red chalcedony colored mainly by iron oxides
Category: gemstone
Identified: August 8, 2026
Method: Standard

AI Estimated Value

About $2–$10 for a small common tumbled piece; $20–$100+ for larger, vividly colored, translucent gem-quality 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

Typically Mohs hardness 6.5–7, vitreous to waxy luster, translucent orange to reddish-orange color, and no visible cleavage; its microcrystalline quartz structure gives a smooth, tough surface.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, later incorporating iron impurities; deposits range from ancient volcanic terrains to younger sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, seals, and tumbled stones; common polished pieces are inexpensive, while vivid, translucent material has greater jewelry value.

Geological facts

Carnelian is a variety of chalcedony, and heating can intensify its orange-red color. The specimen appears polished or tumbled rather than naturally weathered.

Field identification & locations

Identify it by its uniform orange color, translucency, waxy polish, and lack of cleavage; glass may imitate it but often shows bubbles or a sharper, glassier luster. Common sources include India, Brazil, Uruguay, Madagascar, and Botswana.