gemstone

Polished yellow-orange chalcedony (likely carnelian or yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; waxy to vitreous luster, translucent to opaque, smooth conchoidal fracture, and no cleavage. The even honey-yellow color and oval polish are consistent with yellow chalcedony, though dyed agate or resin cannot be excluded from the image alone.

Identified August 14, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits microscopic quartz fibers in cavities and fractures of volcanic rocks, commonly during the Cenozoic or older volcanic episodes. Iron impurities can produce yellow, orange, or reddish colors.

Uses & applications

Used for cabochons, beads, carvings, and tumbled stones; durable enough for jewelry and ornamental objects. Common polished pieces usually have modest value.

Geological facts

Chalcedony is cryptocrystalline quartz, so individual crystals are not visible without magnification. A glass scratch test or hardness comparison can help distinguish it from softer imitation materials.

Field identification & locations

Commonly found in Brazil, Uruguay, India, Madagascar, Namibia, Turkey, and the United States. Look for a waxy feel, natural color zoning, translucency at thin edges, and conchoidal fracture; professional testing is needed to confirm identity.