gemstone

Tumbled red jasper or carnelian

Cryptocrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

AI-generated identification · may be incorrect

Small polished/tumbled, reddish-brown translucent-to-opaque stone with vitreous to waxy luster; Mohs hardness 6.5–7, no visible cleavage, microcrystalline quartz structure, specific gravity about 2.6.

Identified August 12, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures, with iron oxides producing the red coloration; generally Cenozoic to older depending on its host deposit.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; common pieces have modest value.

Geological facts

Carnelian is the more translucent orange-red variety of chalcedony, while jasper is typically opaque and often patterned; the image may show either or a mixture.

Field identification & locations

Look for hardness sufficient to scratch glass, a smooth waxy polish, and absence of cleavage; iron-rich red color supports jasper or carnelian. Common sources include Brazil, India, Madagascar, Uruguay, and the United States.