gemstone

Likely tumbled carnelian or orange chalcedony

Microcrystalline quartz, SiO₂ (chalcedony variety)

AI-generated identification · may be incorrect

Typically orange-brown, translucent to opaque, with a waxy to vitreous luster; hardness 6.5–7 Mohs, trigonal crystal structure, no cleavage, and specific gravity about 2.6. The small polished fragment appears consistent with this material, though image-only identification is uncertain.

Identified August 21, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; iron impurities produce the orange-red color. Deposits range from ancient volcanic terrains to relatively young sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, and inexpensive jewelry; larger masses are used decoratively. Common tumbled pieces generally have modest value.

Geological facts

Carnelian is orange-red chalcedony, while paler honey-orange material may be called orange chalcedony or sard. Heating can intensify its reddish color.

Field identification & locations

Look for even fine texture, waxy luster, translucency at thin edges, and hardness sufficient to scratch glass; it should not fizz in dilute acid. Common sources include India, Brazil, Uruguay, Madagascar, and the United States.