mineral

Red/orange chalcedony (carnelian), possibly dyed or heat-treated

Chalcedony, cryptocrystalline SiO₂ (quartz variety)

AI-generated identification · may be incorrect

Typically translucent orange-red with a waxy to vitreous luster, hardness 6.5–7 Mohs, no visible cleavage, and conchoidal fracture; the specimen appears roughly chipped or tumbled. Color zoning and internal fractures are consistent with carnelian, though treatment cannot be confirmed from an image.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits microcrystalline quartz in volcanic cavities and fractures, commonly during the Cenozoic or older hydrothermal episodes. Iron impurities produce the red-orange color, often enhanced by heating or dyeing.

Uses & applications

Used for beads, cabochons, carvings, seals, and inexpensive jewelry; attractive polished pieces are popular among mineral collectors.

Geological facts

Carnelian is a translucent red-orange variety of chalcedony, historically used for engraved signet stones in Egypt, Rome, and the ancient Near East.

Field identification & locations

Common sources include India, Brazil, Uruguay, Madagascar, and Germany. Check for waxy luster, conchoidal fracture, translucency, and hardness; glass imitations may show bubbles and scratch more easily.