mineral

Tumbled amber-colored agate or chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent honey-orange to brown with cloudy internal bands or fractures; waxy to vitreous luster and no visible cleavage. The rounded shape and smooth surface indicate mechanical tumbling and polishing.

Identified September 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures in volcanic rock, later developing cryptocrystalline quartz and iron staining; commonly Cenozoic to older, depending on the host rock.

Uses & applications

Used as an inexpensive ornamental stone, cabochon, paperweight, and lapidary material; generally not valuable as fine jewelry unless strongly patterned or unusually translucent.

Geological facts

Agate is a banded variety of chalcedony, while visually plain material may be sold simply as orange chalcedony or carnelian. The orange color commonly comes from iron oxides.

Field identification & locations

Identify by its glass-scratching hardness, waxy translucence, lack of cleavage, and subtle curved banding; common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the United States.