mineral

Tumbled carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange color typically from iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange to reddish-brown with a waxy-to-glassy luster and no visible cleavage. Hexagonal quartz structure occurs as microscopic interlocking crystals; the specimen is polished and rounded.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in cavities and fractures, with iron compounds producing the color. Agates form in many volcanic and sedimentary settings over geological time; the specimen’s specific age and source cannot be determined from the image.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; durable and popular with collectors.

Geological facts

Carnelian has been used for seals and jewelry since antiquity. Color can vary with iron content and heat treatment.

Field identification & locations

Look for translucent orange chalcedony, often with subtle bands or cloud-like zones; hardness and waxy luster help distinguish it from softer imitations. Common sources include India, Brazil, Uruguay, and Madagascar.