mineral

Polished orange agate (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

AI-generated identification · may be incorrect

Orange-brown, slightly translucent, with a waxy to vitreous polish and no visible cleavage; Mohs hardness 6.5–7, trigonal quartz structure, specific gravity about 2.6. The small polished piece obscures its natural banding, so exact identification is uncertain.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater deposited microscopic quartz in rock cavities, later colored by iron oxides; agate deposits form in volcanic and other host rocks over geological time.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; agate is also used for small industrial components and ornaments.

Geological facts

Carnelian is a traditional variety of chalcedony, prized since antiquity for seals and jewelry.

Field identification & locations

Look for hardness, waxy luster, translucence, and—on unpolished material—distinct bands or mottling. Agate is widespread, especially in volcanic regions; confirm carnelian by examining color and translucence against strong light.