gemstone

Tumbled carnelian (likely)

Carnelian, a reddish-orange variety of chalcedony; microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Translucent orange-red to brown, waxy/glassy luster, Mohs hardness 6.5–7, trigonal quartz structure; no visible cleavage. The image shows a small polished/tumbled piece, but exact identification is uncertain from appearance alone.

Identified September 27, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as silica-rich chalcedony in cavities and veins, with iron impurities producing its color; deposits occur in volcanic and sedimentary settings across many geological ages.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; also collected as a common tumbled stone.

Geological facts

Carnelian has been used for jewelry and seals since antiquity; heating can deepen its reddish color.

Field identification & locations

Look for translucent orange-red color and a smooth, glassy-waxy surface; common sources include India, Brazil, and Uruguay. Similar jasper or dyed chalcedony can look alike.