mineral

Dyed Agate

SiO2 (Silicon Dioxide)

Hardness: 6.5-7, Color: Bright blue with white banding (artificially dyed), Luster: Vitreous, Crystal structure: Cryptocrystalline (chalcedony), Cleavage: None, Specific gravity: 2.58-2.64

Hardness: 6

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Bright blue with white banding (artificially dyed), Luster: Vitreous, Crystal structure: Cryptocrystalline (chalcedony), Cleavage: None, Specific gravity: 2.58-2.64

Formation & geological history

Formed in volcanic rocks or ancient lavas where silica-rich fluids deposit in cavities. The banding is natural, but the vivid blue color is the result of artificial dyeing.

Uses & applications

Used primarily in jewelry making, ornamental carvings, and decorative items. Very common in commercial gemstone markets.

Geological facts

Agate is highly porous, which allows it to be easily dyed in vibrant colors like pink, purple, and blue. This practice of dyeing agate dates back to ancient Rome.

Field identification & locations

Identifier by its characteristic banding and waxy luster. The unnaturally bright blue color is a clear indicator that the specimen has been artificially dyed. Commonly found in craft stores and gem shows.