gemstone

Tumbled orange-brown gemstone, likely carnelian

Carnelian (orange chalcedony, microcrystalline quartz; SiO₂)

AI-generated identification · may be incorrect

Small polished oval with orange-to-reddish-brown color and waxy to vitreous luster. Quartz hardness is 7 Mohs; cryptocrystalline, with no visible cleavage. The photograph does not show enough detail for a certain identification.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as iron-colored chalcedony, commonly filling cavities and veins in volcanic rocks; its age varies with the host rocks. The specimen appears tumbled and polished after formation.

Uses & applications

Used for beads, cabochons, jewelry, and decorative objects; also collected as a small polished specimen.

Geological facts

Carnelian’s color comes chiefly from iron impurities. It has been used for seals and ornaments since antiquity.

Field identification & locations

Look for translucent orange-red chalcedony with a smooth, waxy polish and no visible crystal faces; common sources include India, Brazil, and Uruguay. A photo alone cannot distinguish it confidently from other polished stones.