Mineral (Chalcedony)
Dyed Agate
Silicon dioxide, SiO2
Hardness 6.5-7 on Mohs scale, vitreous luster, cryptocrystalline structure. This specific piece has been artificially dyed blue and exhibits a crackle 'dragon veins' pattern as well as natural agate banding.
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Physical properties
Hardness 6.5-7 on Mohs scale, vitreous luster, cryptocrystalline structure. This specific piece has been artificially dyed blue and exhibits a crackle 'dragon veins' pattern as well as natural agate banding.
Formation & geological history
Agate forms as nodules or geodes in volcanic rocks, filling cavities left by trapped gases. The crackle effect and bright blue color on this piece are the result of artificial heating, quenching, and dyeing processes after mining.
Uses & applications
Used primarily in inexpensive jewelry and crafts as beads or cabochons.
Geological facts
Also known commercially as 'Dragon Vein Agate', this crackled appearance is created by heating the stone and plunging it into cold water or dye, causing the surface to fracture. The dye then easily penetrates these fractures.
Field identification & locations
Can be identified as dyed/treated due to the unnaturally vibrant color and the web-like crackle pattern which is a hallmark of 'dragon vein' treatment. Banding is visible on the right side.
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