mineral

Tumbled carnelian (reddish chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent cream to orange-red with a waxy luster and no visible crystals. It is a polished, rounded pebble; the photo alone cannot confirm whether the reddish area is natural banding or a surface stain.

Identified October 10, 2026More mineral →

Explore Tumbled carnelian (reddish chalcedony) in the encyclopedia →

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Physical properties

Formation & geological history

Silica-rich fluids deposit chalcedony in rock cavities and fractures; iron impurities create the red-orange color. Such deposits occur across many geological ages and settings.

Uses & applications

Used for beads, cabochons, small carvings, and collectibles; chalcedony is also used decoratively in ornamental objects.

Geological facts

Carnelian is a variety of chalcedony, not a separate mineral species; heating can intensify its reddish color.

Field identification & locations

Look for translucent edges, a smooth waxy appearance, and hardness sufficient to resist scratching by a steel blade. Carnelian is found in regions including India, Brazil, Uruguay, and Madagascar.