mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) with artificial dye
Hardness: 6.5-7 on Mohs scale. Luster: Vitreous to waxy. Crystal structure: Hexagonal (cryptocrystalline). Color: Naturally translucent gray/white but artificially dyed vibrant blue. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Luster: Vitreous to waxy. Crystal structure: Hexagonal (cryptocrystalline). Color: Naturally translucent gray/white but artificially dyed vibrant blue. Specific gravity: 2.58-2.64.
Formation & geological history
Formed as secondary deposits in volcanic rock cavities (vesicles) where silica-rich groundwater precipitates over millions of years. This specific slice is a cut section of a geode nodule.
Uses & applications
Decorative use, coasters, jewelry pendants, and metaphysical displays. Commonly sold in gift shops and mineral shows.
Geological facts
While agate can naturally be blue (known as Blue Lace Agate), the electric blue seen here is almost always achieved through chemical dyeing, a common practice since ancient Roman times to enhance natural banding.
Field identification & locations
Identify by the concentric banding patterns and the porous nature of the outer 'rind' which allows it to absorb dyes. It is a common find in Brazil and Uruguay.
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