mineral

Tumbled orange chalcedony

Chalcedony (microcrystalline quartz, SiO₂), likely orange carnelian

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, translucent orange to honey-brown, with a waxy to vitreous luster and no visible cleavage; cryptocrystalline quartz has a trigonal structure. The smooth rounded form indicates tumbling or natural abrasion.

Identified September 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, precipitating as microcrystalline quartz; orange color commonly results from iron oxides. Chalcedony occurs from many geological ages, especially in volcanic terrains.

Uses & applications

Used for beads, carvings, cabochons, ornaments, and lapidary specimens; common tumbled pieces generally have modest value.

Geological facts

Carnelian is the orange-red variety of chalcedony, though color boundaries with orange chalcedony are informal. It may be dyed or heat-treated in commercial material.

Field identification & locations

Identify by its glassy/waxy appearance, lack of cleavage, hardness, and inability to scratch with a steel nail easily; common sources include India, Brazil, Uruguay, Madagascar, and the United States.