mineral
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
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
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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.
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