gemstone

Polished carnelian-bearing chalcedony (orange agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange, honey, cream, and brown zones with waxy to vitreous luster. Fibrous cryptocrystalline quartz, typically without visible cleavage; specific gravity about 2.6.

Identified August 30, 2026More gemstone →

Explore Polished carnelian-bearing chalcedony (orange agate) in the encyclopedia →

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Physical properties

Formation & geological history

Silica-rich groundwater filled cavities and fractures in volcanic rock, later developing orange-red coloration from dispersed iron oxides. The specimen’s precise geological age and locality cannot be determined from the image.

Uses & applications

Used as a cabochon, tumbled stone, carving material, beads, and ornamental objects; durable but generally modestly priced.

Geological facts

Carnelian is the orange-red variety of chalcedony; banded or patterned material is commonly marketed as agate. Polishing enhances its translucency and color contrast.

Field identification & locations

Identify by its hardness, waxy luster, translucency, conchoidal fracture, and inability to scratch with a steel knife easily; avoid confusing it with dyed glass or resin. Common sources include Brazil, India, Uruguay, Madagascar, and the United States.