mineral

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Hardness: 6.5-7 on Mohs scale; Color: Deep teal/blue (artificially enhanced); Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.64

Hardness: 6
Color: Deep teal/blue (artificially enhanced)
Luster: Vitreous to waxy

Identified March 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in volcanic rock cavities (vesicles) where silica-rich groundwater deposited layers over thousands of years. Natural agate is often grey or white; the vibrant blue seen here is achieved through an industrial staining process.

Uses & applications

Used primarily for ornamental purposes, jewelry (pendants, beads), worry stones, home decor, and metaphysical collections.

Geological facts

Agate has been used by humans since the Neolithic era. While blue lace agate is naturally occurring, the deep monochromatic 'ink' blue of this specimen is almost always the result of soaking porous agate in a solution of iron salts or potassium ferricyanide.

Field identification & locations

Identify by its waxy luster and the presence of conchoidal (shell-like) fractures where chips occur. It is harder than glass and can scratch a steel knife blade. It is found globally, with major deposits in Brazil and Uruguay.

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