gemstone

Tumbled orange agate (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony commonly called carnelian

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange to reddish, waxy/glassy luster, cryptocrystalline quartz structure, no visible cleavage. The image shows a small polished pebble; color and identity cannot be confirmed from appearance alone.

Identified October 8, 2026More gemstone →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in cavities and fractures, often in volcanic rocks; the material may be millions of years old. It has been shaped and polished by tumbling.

Uses & applications

Used for beads, cabochons, carvings, and inexpensive jewelry or collecting.

Geological facts

Carnelian is a variety of chalcedony; iron oxides produce its warm orange-red color.

Field identification & locations

Look for translucence at thin edges, fine-grained texture, and hardness sufficient to scratch glass; common sources include Brazil, India, Uruguay, and Madagascar.