gemstone

Polished orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-stained chalcedony

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange to honey-yellow, waxy/glassy luster, cryptocrystalline quartz with no cleavage, conchoidal fracture, and specific gravity about 2.60–2.65. The rounded, glossy surface indicates tumbling or polishing.

Identified August 13, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, with iron oxides producing orange-red coloration; deposits range from Paleozoic to Cenozoic in age. Common sources include India, Brazil, Uruguay, Madagascar, Germany, and the western United States.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive jewelry; large polished pieces are popular as display stones.

Geological facts

Carnelian is the orange-red variety of chalcedony, while paler honey-orange material may be called orange chalcedony or yellow carnelian. Color can be intensified naturally or by heat treatment.

Field identification & locations

Identify by its even waxy translucency, lack of visible quartz grains, hardness, and conchoidal fracture; it should not scratch easily with a steel knife. This specimen could also be iron-stained jasper if notably opaque.