gemstone

Polished carnelian (orange chalcedony)

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

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange, cream, and white banding with a waxy-to-glassy luster. Microcrystalline quartz, with no visible cleavage and conchoidal fracture; the image suggests a small polished piece.

Identified October 13, 2026More gemstone →

Explore Polished carnelian (orange chalcedony) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids deposit quartz in rock cavities and fractures; iron impurities produce orange-red colors. Chalcedony occurs in rocks of many ages, often in volcanic settings.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; historically used for seals and jewelry.

Geological facts

Carnelian color may be enhanced by heating, a traditional treatment. The specimen’s small size and polish limit confident identification from the image alone.

Field identification & locations

Look for translucent orange chalcedony, waxy luster, and hardness sufficient to scratch glass; common sources include India, Brazil, and Uruguay. Similar-looking agate or other chalcedony may be difficult to distinguish visually.