gemstone

Orange carnelian (likely tumbled chalcedony)

Carnelian, an orange variety of chalcedony (microcrystalline quartz, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; orange to reddish-orange, translucent, with a waxy to vitreous luster and no visible cleavage. The image suggests a small, polished or naturally rounded piece, but its identity cannot be confirmed visually alone.

Identified September 26, 2026More gemstone →

Explore Orange carnelian (likely tumbled chalcedony) in the encyclopedia →

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Physical properties

Formation & geological history

Forms when silica-rich fluids deposit chalcedony in rock cavities; iron oxides create its orange color. Carnelian occurs in rocks of many ages, especially volcanic-hosted veins and sedimentary gravels.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; historically valued for seals and jewelry.

Geological facts

Carnelian is a cryptocrystalline form of quartz, so its crystals are too small to see without magnification.

Field identification & locations

Look for a uniform orange color, translucence at thin edges, and hardness near 7; common sources include India, Brazil, Uruguay, and Madagascar. Similar-looking glass or dyed materials may require testing to distinguish.