gemstone

Tumbled orange-red stone, possibly carnelian

Likely carnelian, an orange variety of chalcedony (microcrystalline SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Opaque to slightly translucent orange-red, smooth polished surface and waxy-to-vitreous luster. If carnelian, hardness is about 6.5–7 Mohs, with no visible cleavage and a trigonal quartz structure.

Identified October 2, 2026More gemstone →

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Physical properties

Opaque to slightly translucent orange-red, smooth polished surface and waxy-to-vitreous luster. If carnelian, hardness is about 6.5–7 Mohs, with no visible cleavage and a trigonal quartz structure.

Formation & geological history

Carnelian forms as silica-rich chalcedony, commonly filling cavities and veins in volcanic rocks; its iron compounds produce the orange-red color. Such deposits occur in many ages and regions.

Uses & applications

Used in beads, cabochons, carvings, and decorative objects; small tumbled pieces are commonly sold as inexpensive collectibles.

Geological facts

Carnelian has been used for seals and jewelry since antiquity. Its color may be enhanced by heating or dyeing.

Field identification & locations

The rounded shape suggests a tumbled or polished specimen. Confirm with translucency at the edges, hardness testing by a professional, and inspection for natural color banding; the photo alone cannot distinguish it reliably from other orange stones.