mineral
Dyed agate geode slice
Banded chalcedony (microcrystalline SiO₂), commonly sold as a dyed agate slice
AI-generated identification · may be incorrectHardness 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.
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Physical properties
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.
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.
