mineral

Banded agate (likely a polished agate slice)

Microcrystalline quartz, chiefly chalcedony (SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent cream, honey-orange, and gray bands with a waxy to vitreous luster. Quartz has a trigonal crystal structure, but chalcedony shows no visible cleavage and breaks conchoidally. The image’s surface and scale limit certainty; banded chalcedony is the best visual match.

Identified September 23, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited successive layers in cavities, commonly in volcanic rocks; agates form across a range of geological ages.

Uses & applications

Polished slices and cabochons are used in jewelry and ornament; agate is also used for small decorative objects and precision components.

Geological facts

Agate’s curved or irregular color bands record changes in silica deposition and trace impurities during growth.

Field identification & locations

Look for fine, curved bands and a smooth, waxy surface; common sources include Brazil, Uruguay, India, and the western United States. Confirm identification by hardness and close inspection of the banding.