mineral

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red color commonly from iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent cream, orange, and reddish-brown bands; waxy to vitreous luster; trigonal quartz structure, with no visible cleavage and conchoidal fracture. The image shows a polished, irregular stone; exact identification is uncertain from appearance alone.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms as silica-rich chalcedony filling cavities and fractures, often in volcanic rocks; iron impurities produce its warm colors. These deposits occur in rocks of many ages.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; historically made into seals and jewelry.

Geological facts

Carnelian is a traditional variety of chalcedony, and its color may be enhanced by heating or dyeing.

Field identification & locations

Look for translucency, waxy luster, and curved fracture surfaces; common sources include India, Brazil, and Uruguay. This specimen’s polish obscures diagnostic details.