mineral

Dyed agate slice

Microcrystalline quartz (SiO₂), commonly chalcedony; blue color appears artificially dyed

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; vivid blue, waxy to vitreous luster, cryptocrystalline structure, no visible cleavage. The thin slice and banded edge are characteristic of agate; color is likely enhanced by dye.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in layers over time. The natural formation may be millions of years old; the blue color treatment is modern.

Uses & applications

Polished slices are used for jewelry, ornaments, crafts, and collecting; agate is also used for decorative objects and small precision components.

Geological facts

Agate is a variety of banded chalcedony. Intense, uniform blue is uncommon naturally and often produced by dyeing porous agate.

Field identification & locations

Look for translucent edges and fine concentric or irregular bands; dye may concentrate along cracks and the rim. Agate occurs worldwide, notably in Brazil, Uruguay, India, and the United States.