mineral

Orange chalcedony (possibly carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red varieties are called carnelian

AI-generated identification · may be incorrect

Translucent orange, waxy to vitreous luster, no visible crystal faces; hardness 6.5–7 Mohs, conchoidal fracture, specific gravity about 2.6. The image shows a small, irregular fragment; identification as carnelian is uncertain from appearance alone.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in cavities and fractures, later forming tightly intergrown microscopic crystals. Chalcedony occurs in many geological ages and settings, including volcanic rocks and sedimentary deposits.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; chalcedony is also collected as a mineral specimen.

Geological facts

Carnelian’s orange color commonly comes from iron impurities; heating can deepen or alter its color.

Field identification & locations

Look for translucent orange-red color, waxy luster, and hardness sufficient to scratch glass; distinguish it from softer orange minerals by hardness. Chalcedony is widespread, including in volcanic regions and gravel deposits.