gemstone

Likely tumbled or cut carnelian

Microcrystalline quartz (SiO₂), chalcedony variety colored by iron oxides

AI-generated identification · may be incorrect

Translucent reddish-orange, waxy to vitreous luster, cryptocrystalline structure, no visible cleavage, conchoidal fracture; Mohs hardness 6.5–7 and specific gravity about 2.6. The blocky shape indicates cutting or polishing.

Identified August 26, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, with iron impurities producing red-orange color; commonly Cenozoic to older volcanic-hosted deposits. The image alone cannot establish exact age or locality.

Uses & applications

Used for beads, cabochons, carvings, seals, and ornamental objects; durable and affordable compared with many transparent gems.

Geological facts

Carnelian is a translucent red-orange form of chalcedony; deeper red material may be called sard. Color can be enhanced by heating or dyeing.

Field identification & locations

Identify by its even red-orange body color, translucency, hardness, and lack of cleavage; glass may show bubbles and feels softer. Common sources include India, Brazil, Uruguay, Madagascar, and Germany.