mineral

Tumbled carnelian agate

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

AI-generated identification · may be incorrect

Translucent orange-and-cream stone with a smooth, polished surface and waxy luster; quartz has Mohs hardness 7 and trigonal crystal structure, though chalcedony lacks visible crystals. The image does not show enough detail to confirm the exact variety.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms as silica-rich fluids fill cavities and fractures in volcanic rocks; iron impurities produce orange to reddish colors. Agate deposits formed in many geological periods, commonly in volcanic settings.

Uses & applications

Tumbled pieces are used in jewelry, decorative objects, and mineral collections; agate is also used for ornamental carvings and, historically, precision components.

Geological facts

Carnelian is a traditional name for orange-red chalcedony; banding or translucent color zones can help distinguish agate from other orange stones.

Field identification & locations

Look for translucent orange chalcedony, possible curved bands, and a glassy-to-waxy polish; common sources include Brazil, India, and Uruguay. A hand-sized tumbled specimen is typically inexpensive.