gemstone

Tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange-red variety commonly called carnelian

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; orange-brown, translucent in thinner areas, with waxy to vitreous luster and no visible cleavage. Its rounded, polished form is human-processed; internal cloudy banding or iron-rich coloration is typical.

Identified August 16, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, with iron oxides producing the red-orange color; commonly Cenozoic to older volcanic-hosted material. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; small tumbled pieces commonly sell for about $1–$10, while fine translucent specimens or jewelry may cost $20–$200+.

Geological facts

Carnelian is a variety of chalcedony rather than a separate mineral species. Heating can intensify its red-orange color, and some commercial material is dyed or heat-treated.

Field identification & locations

Identify by its orange-to-red color, translucency, waxy luster, quartz-like hardness, and lack of cleavage; common sources include India, Brazil, Uruguay, Madagascar, and the United States. The image supports a likely identification, but not a definitive one.