mineral
Dyed Blue Agate Geode Slice
Chalcedony (Silicon Dioxide, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Intense deep blue (dyed), translucent to opaque; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None
- Hardness
- 6
- Color
- Intense deep blue (dyed), translucent to opaque
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Intense deep blue (dyed), translucent to opaque; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None
Formation & geological history
Formed in volcanic or sedimentary cavities where silica-rich groundwater deposited layers of chalcedony over time. These often originate from Brazil or Uruguay.
Uses & applications
Decorative ornaments, bookends, coasters, and metaphysical collecting.
Geological facts
Natural agate is rarely this shade of cobalt blue; this piece has been artificially dyed by soaking the porous stone in mineral salts. The central cavity contains tiny quartz druzy crystals.
Field identification & locations
Identify in the field by looking for nodular round rocks. This specific specimen is identified by its banded patterns and the artificial color concentration in the more porous outer rings.
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