gemstone

Tumbled orange chalcedony (likely carnelian)

Carnelian, a microcrystalline variety of quartz; SiO₂, commonly colored by iron oxides

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange-red body with glassy/waxy luster and no visible cleavage. It has cryptocrystalline quartz structure and typically specific gravity near 2.60–2.65.

Identified August 14, 2026More gemstone →

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Physical properties

Hardness 6.5–7 Mohs; translucent orange-red body with glassy/waxy luster and no visible cleavage. It has cryptocrystalline quartz structure and typically specific gravity near 2.60–2.65.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, later acquiring orange coloration from iron. Deposits occur in relatively young to ancient volcanic and sedimentary terrains; exact age cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, seals, and inexpensive jewelry; polished pieces are popular decorative and lapidary material.

Geological facts

The image shows a small polished, drilled bead rather than a natural crystal. Orange chalcedony may be naturally colored or heat-treated to intensify its red-orange tone.

Field identification & locations

Identify by its waxy translucent appearance, lack of cleavage, and quartz hardness; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Uruguay, Madagascar, and Germany.