gemstone

Tumbled carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red iron-colored bands suggest carnelian with agate banding

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent reddish-orange and brown, waxy to vitreous luster, cryptocrystalline quartz structure, no visible cleavage, conchoidal fracture; specific gravity about 2.6.

Identified October 4, 2026More gemstone →

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Physical properties

Mohs hardness 6.5–7; translucent reddish-orange and brown, waxy to vitreous luster, cryptocrystalline quartz structure, no visible cleavage, conchoidal fracture; specific gravity about 2.6.

Formation & geological history

Silica-rich fluids deposited chalcedony in rock cavities, with iron oxides producing the warm colors and banding. Such deposits form in volcanic or other silica-bearing rocks over geologic time; the specimen has been shaped and polished by tumbling.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; durable and affordable for jewelry.

Geological facts

Carnelian has been used for seals and ornaments since antiquity. Its color may be naturally concentrated or enhanced by heat treatment.

Field identification & locations

Look for translucent orange-red chalcedony, often with subtle curved bands and a waxy polish; common sources include India, Brazil, Uruguay, and Madagascar. The image is consistent with tumbled carnelian/agate, though exact identification requires examination.