mineral

Tumbled orange-brown stone, likely carnelian or iron-stained chalcedony

Chalcedony (microcrystalline SiO₂), possibly iron-oxide-colored carnelian

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent to opaque orange-brown with a waxy to vitreous luster and no visible cleavage. The rounded, glossy surface appears tumbled; identification from the image is uncertain.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in cavities or fractures, with iron oxides producing the warm color. Such deposits formed in varied geological settings and ages.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; chalcedony is also collected as a mineral specimen.

Geological facts

Carnelian is an orange-red variety of chalcedony, while brown or mottled material is often sold more broadly as agate or chalcedony.

Field identification & locations

Look for waxy translucence, fine texture, and hardness sufficient to scratch glass; these clues help distinguish it from softer stones. Chalcedony occurs worldwide, including Brazil, India, Uruguay, and the United States.