mineral

Blue Agate Geode Slice

Silicon Dioxide (SiO2) - Chalcedony variety

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs). Color: Naturally translucent white/grey, seen here dyed dark blue. Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None.

Hardness: 6
Color: Naturally translucent white/grey, seen here dyed dark blue
Luster: Vitreous to waxy

Identified July 8, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs). Color: Naturally translucent white/grey, seen here dyed dark blue. Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None.

Formation & geological history

Formed as secondary deposits in volcanic rock cavities (vesicles) where silica-rich groundwater precipitates layers over millions of years. This specimen is a sliced and likely dyed geode cross-section.

Uses & applications

Primarily used as decorative display pieces, coasters, bookends, or in jewelry as cabochons. Believed by some to have metaphysical balancing properties.

Geological facts

The intense blue color in this specific specimen is the result of artificial dyeing, a common practice in the industry to enhance the natural banding of Brazilian agates.

Field identification & locations

Identify by concentric banding, translucent layers, and a crystalline center. Often found in basaltic lava flows in regions like Rio Grande do Sul, Brazil.