mineral

Polished banded agate

Agate, a variety of microcrystalline quartz (SiO₂; chalcedony)

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; orange and cream curved bands, waxy to vitreous luster, trigonal quartz structure, and no visible cleavage. The specimen appears tumbled or polished.

Identified October 13, 2026More mineral →

Explore Polished banded agate in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Mohs hardness 6.5–7; orange and cream curved bands, waxy to vitreous luster, trigonal quartz structure, and no visible cleavage. The specimen appears tumbled or polished.

Formation & geological history

Silica-rich fluids deposited successive chalcedony layers in cavities, commonly in volcanic rocks. Agates form across many geological ages; the image does not establish a specific locality or age.

Uses & applications

Used for jewelry, ornaments, carvings, and collectors’ specimens; agate is also used for beads and small decorative objects.

Geological facts

Agate’s distinctive bands form as silica accumulates in layers, often producing concentric or irregular patterns.

Field identification & locations

Identify by its fine-grained, translucent-to-opaque appearance and curved, contrasting bands; common sources include Brazil, Uruguay, India, and the western United States. The pictured orange color may be natural or enhanced by dye or heat.