mineral

Polished brown banded agate cabochon

Agate, a microcrystalline variety of silica (SiO₂), chiefly chalcedony

AI-generated identification · may be incorrect

Polished, rounded and opaque-to-translucent brown with pale bands; Mohs hardness 6.5–7, waxy to vitreous luster, trigonal silica structure, and no distinct cleavage. The image does not reveal enough detail to confirm the exact agate variety.

Identified September 27, 2026More mineral →

Explore Polished brown banded agate cabochon in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Agate forms as silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks; the bands record changes in fluid chemistry. Its age depends on its source deposit, which cannot be determined from the image.

Uses & applications

Used for cabochons, jewelry, carvings, and decorative objects; agate is also used for small technical components and abrasives.

Geological facts

Agate’s characteristic bands can form concentric or irregular patterns, and polished pieces often display them more clearly than rough specimens.

Field identification & locations

Look for fine, curved or parallel bands and a glassy-to-waxy polish; agate occurs worldwide, notably in Brazil, Uruguay, India, and the United States. A small polished cabochon like this commonly sells for about $5–$30, depending on pattern, size, and workmanship.