gemstone

Tumbled yellow chalcedony (likely yellow agate/carnelian)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-stained agate

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent honey-yellow to orange, waxy/glassy luster, cryptocrystalline structure, and no visible cleavage. The smooth oval shape indicates tumbling and polishing.

Identified September 15, 2026More gemstone →

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Physical properties

Mohs hardness 6.5–7; translucent honey-yellow to orange, waxy/glassy luster, cryptocrystalline structure, and no visible cleavage. The smooth oval shape indicates tumbling and polishing.

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures in volcanic rocks, with iron oxides producing yellow-orange color; commonly Cenozoic to older, depending on host rock.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive jewelry; also collected as a decorative stone.

Geological facts

Yellow chalcedony is often marketed as yellow agate or yellow carnelian, although precise naming depends on banding, translucency, and color. The image alone cannot distinguish natural color from possible dyeing or heat treatment.

Field identification & locations

Identify by its waxy appearance, uniform translucency, hardness, and lack of cleavage; glass may show bubbles and scratches more easily. Common sources include Brazil, Uruguay, India, Madagascar, and Mexico.