mineral

Polished banded agate

Microcrystalline quartz (chalcedony), SiO₂

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; orange, cream, and reddish-brown bands with a waxy-to-glassy polish. Trigonal quartz structure, typically without visible cleavage; specific gravity about 2.6.

Identified September 23, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; orange, cream, and reddish-brown bands with a waxy-to-glassy polish. Trigonal quartz structure, typically without visible cleavage; specific gravity about 2.6.

Formation & geological history

Silica-rich fluids deposited successive chalcedony layers in a cavity, commonly in volcanic rock; the specimen has been cut and polished. Agates formed in many geological periods, so age cannot be determined from the image.

Uses & applications

Used for cabochons, jewelry, carvings, and decorative objects; also collected as a polished specimen.

Geological facts

The parallel, curved color bands are characteristic of agate and reflect changes in deposition conditions.

Field identification & locations

Look for translucent chalcedony with distinct curved or concentric bands; agate occurs worldwide, especially in volcanic regions and river gravels. The image does not establish a specific locality or variety.