mineral
Dyed Blue Agate
Chalcedony (Silicon Dioxide / SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Cobalt blue (artificially dyed), Luster: Vitreous to waxy, Structure: Cryptocrystalline, Fracture: Conchoidal
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Cobalt blue (artificially dyed), Luster: Vitreous to waxy, Structure: Cryptocrystalline, Fracture: Conchoidal
Formation & geological history
Formed as secondary deposits of silica in cavities of volcanic rocks. This specimen has been sliced and chemically dyed with cobalt(II) nitrate before being baked to achieve the deep blue color.
Uses & applications
Ornamental use, gemstone jewelry, crystal healing, and as home decor (coasters, bookends).
Geological facts
Natural agate is rarely this vibrant shade of blue; most bright blue agates found in shops are dyed. The process of dyeing agate has been practiced for over 2,000 years, originating in ancient Rome.
Field identification & locations
Identify by its characteristic banding patterns and translucency. While natural flint/chert is found in the user's region (SE Ireland), this specific vibrant cobalt specimen is an imported, processed item. Look for dye concentration in cracks.
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