mineral

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial cobalt-based dye

Hardness: 6.5-7 (Mohs scale), Color: Vivid neon blue with white banding, Luster: Vitreous/Waxy, Crystal Structure: Hexagonal (Cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.64

Hardness: 6

Identified May 28, 2026More mineral →

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Physical properties

Formation & geological history

Agates form as nodules in volcanic rocks or ancient lavas, where silica-rich fluids fill cavities. The intense blue color in this specimen is achieved post-extraction through a chemical dyeing process, as natural bright blue agate is extremely rare.

Uses & applications

Used primarily for ornamental purposes, jewelry, lapidary art, and collection as a decorative stone. Often used for bookends, coasters, and tumbled pocket stones.

Geological facts

Agate is a variety of chalcedony. The practice of dyeing agate dates back to the ancient Romans, though modern techniques use more stable inorganic pigments to create vibrant colors not found in nature.

Field identification & locations

Identify in the field by its waxy luster and banded patterns. Artificially dyed agates like this one often show a concentration of color in fractures and bands that would be more muted in natural stones. Found globally, especially in Brazil and Uruguay.

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