gemstone

Tumbled carnelian (likely)

Cryptocrystalline silica, chiefly chalcedony (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Smooth, rounded, opaque cream-to-orange stone with a reddish iron-stained area; Mohs hardness 6.5–7, vitreous to waxy luster, microcrystalline quartz structure, no visible cleavage. The photo alone cannot confirm the exact variety.

Identified October 13, 2026More gemstone →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in rock cavities, later colored by iron; the stone appears mechanically tumbled. Chalcedony forms in many geological ages and settings.

Uses & applications

Used for beads, cabochons, carvings, and inexpensive jewelry or collectibles.

Geological facts

Carnelian is an orange-red variety of chalcedony; its color commonly comes from dispersed hematite or other iron oxides.

Field identification & locations

Look for hardness near quartz, a waxy luster, and translucent orange-red zones; common sources include Brazil, India, Uruguay, and Madagascar. This appears to be a small polished specimen.