mineral

Polished banded agate geode slice

Agate, a microcrystalline variety of quartz (SiO₂), with chalcedony bands

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent gray-brown and cream bands, vitreous to waxy polished luster, trigonal quartz structure, no distinct cleavage. The outer rind is rough and earthy, with a polished face exposing the banding.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited successive layers of chalcedony in a cavity, commonly within volcanic rock; agate formation spans many geological ages, often millions of years.

Uses & applications

Used for decorative slices, jewelry, ornaments, and lapidary work; also collected for its distinctive banding.

Geological facts

Agate’s bands record changing conditions as silica-rich fluids filled the original cavity.

Field identification & locations

Identify by curved, fine parallel bands and a silica-rich, hard surface; common sources include Brazil, Uruguay, Mexico, and the western United States. This appears to be a cut and polished specimen with a natural rough rind.