mineral

Dyed agate geode slice

Banded chalcedony (microcrystalline SiO₂), commonly sold as a dyed agate slice

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; vivid blue concentric bands, waxy-to-glassy luster, cryptocrystalline quartz, no prominent cleavage. The flat polished face and saturated, uniform blue suggest artificial dyeing; natural agate is typically less intensely colored.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited successive chalcedony layers in a cavity, commonly in volcanic rock; age varies by deposit, often millions of years. The specimen was cut, polished, and likely dyed after formation.

Uses & applications

Decorative display, jewelry, coasters, and craft work; agate is also used for ornamental objects and precision components.

Geological facts

Agate’s bands record changing conditions as silica accumulated layer by layer; many brightly colored commercial slices are enhanced with dye.

Field identification & locations

Look for curved or concentric bands, a translucent-to-opaque edge, and a hard, glassy surface. Agates occur worldwide, including Brazil, Uruguay, India, and the United States.