mineral

Polished banded agate (likely carnelian or yellow-orange agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with iron-oxide coloration

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; waxy to glassy luster; translucent orange, cream, gray, and brown bands. Cryptocrystalline quartz lacks visible crystal faces and has no cleavage; specific gravity is about 2.6.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, depositing successive chalcedony layers; iron oxides create orange and red colors. Individual agate bands may form over thousands to millions of years, commonly in Cenozoic volcanic environments.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; its durability makes it suitable for jewelry and decorative work.

Geological facts

The specimen appears tumbled and polished, so its natural surface texture and crystal habits are obscured. Strong, regular curved banding is characteristic of agate rather than ordinary jasper.

Field identification & locations

Identify by curved concentric bands, translucency at thin edges, quartz-like hardness, and resistance to scratching by a steel knife. Common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the western United States.