mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) - Variety Agate
Hardness: 6.5-7 Mohs; Color: Dyed deep blue with white/clear quartz center; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64
- Hardness
- 6
- Color
- Dyed deep blue with white/clear quartz center
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Dyed deep blue with white/clear quartz center; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64
Formation & geological history
Agates form in volcanic rock cavities or ancient sedimentary layers where silica-rich groundwater gradually deposits layers of microcrystalline quartz over millions of years.
Uses & applications
Ornamental decor, jewelry, coasters, and metaphysical collecting.
Geological facts
The vibrant blue color seen here is not natural; agates are porous, allowing them to be dyed to enhance their concentric banding patterns. Naturally blue agates, like Blue Lace Agate, are much paler and rarer.
Field identification & locations
Identify in the field by looking for translucent nodules with waxy surfaces. These polished slices are often found in Brazil. Look for the 'tell-tale' bright saturation at the edges which indicates dye absorption.
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