mineral

Orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony is commonly called carnelian

AI-generated identification · may be incorrect

Opaque to translucent orange-yellow with a waxy luster and irregular fracture; quartz hardness is 7 Mohs, trigonal crystal structure at microscopic scale, with no cleavage. The surface appears naturally worn, though the image alone cannot confirm whether it has been polished or treated.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in rock cavities or fractures; iron compounds commonly create the orange color. Chalcedony forms in many geological settings and spans a broad range of ages.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; chalcedony also has limited industrial uses as silica material.

Geological facts

Carnelian is a traditional variety name for red-to-orange chalcedony; color can be enhanced by heating or dyeing.

Field identification & locations

Look for a smooth, waxy surface, conchoidal fracture, and hardness sufficient to scratch glass; common sources include India, Brazil, Uruguay, and Madagascar. Identification as carnelian rather than another orange stone needs closer inspection.