gemstone

Orange tumbled stone, likely carnelian

Carnelian: orange-red microcrystalline quartz, SiO₂ (chalcedony)

AI-generated identification · may be incorrect

Smooth, rounded, opaque-to-translucent orange surface with a waxy luster; quartz hardness is about 7 Mohs, with no visible cleavage and specific gravity near 2.6. The image alone cannot exclude dyed agate, jasper, or another orange silicate.

Identified August 17, 2026More gemstone →

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Physical properties

Formation & geological history

Carnelian forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; iron impurities create the orange-red color. Chalcedony deposits range from ancient to relatively young, often associated with Cenozoic volcanic terrains.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive jewelry; tumbled pieces are commonly sold as collector stones or décor.

Geological facts

Carnelian is a variety of chalcedony, and its color may deepen with gentle heating or sunlight. Ancient Egyptians and Romans used it for seals, amulets, and jewelry.

Field identification & locations

Check for fine translucency, uniform waxy texture, and lack of cleavage; quartz should resist scratching by a steel knife, though testing can damage the specimen. Common sources include India, Brazil, Uruguay, Madagascar, and the United States.