mineral
Dyed Blue Agate Slice
Chalcedony (Silicon Dioxide, SiO2)
Hardness: 6.5-7 Mohs; Color: Naturally grey/white, artificially dyed deep blue; Luster: Vitreous to waxy; Structure: Microcrystalline (trigonal); Cleavage: None; Conchoidal fracture.
- Hardness
- 6
- Color
- Naturally grey/white, artificially dyed deep blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Naturally grey/white, artificially dyed deep blue; Luster: Vitreous to waxy; Structure: Microcrystalline (trigonal); Cleavage: None; Conchoidal fracture.
Formation & geological history
Formed as silica-rich fluids fill cavities in volcanic or sedimentary rocks, creating concentric bands. This specific specimen has been sliced and chemically dyed to enhance the colors.
Uses & applications
Used primarily for ornamental purposes, coasters, jewelry (pendants/cabochons), and as 'healing crystals' or home decor.
Geological facts
Agate is a variety of chalcedony. While the banding is natural, the vibrant electric blue seen here is almost always the result of an iron or potassium ferrocyanide dye process.
Field identification & locations
Identify in the field by its translucent nature, banding, and extreme hardness (will scratch glass). Natural agates are rarely this blue; look for 'pooling' of color in cracks to identify dye.
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