mineral

Orange chalcedony pebble (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

AI-generated identification · may be incorrect

Translucent to opaque orange-brown, with a waxy luster and smooth, rounded surface; quartz has Mohs hardness 7 and a trigonal crystal structure at microscopic scale. The image does not show diagnostic tests, so identification as carnelian is provisional.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in rock cavities, later colored by iron oxides; chalcedony formed in varied geological settings over many ages. Its rounded shape suggests abrasion during transport or tumbling.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; also collected as a small mineral specimen.

Geological facts

Carnelian is a traditional gemstone and has been used in seals and jewelry since antiquity.

Field identification & locations

Look for orange-red color, translucency at thin edges, waxy luster, and hardness sufficient to resist scratching by a steel knife. Chalcedony occurs worldwide, including Brazil, India, and the United States; a small common pebble typically sells for about $1–$10.