Rock Identifier
Blue Dyed Agate Geode Slice (Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye) — mineral
mineral

Blue Dyed Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye

Hardness: 6.5-7 (Mohs); Color: Dyed vibrant blue (naturally gray/white); Luster: Vitreous to waxy; Structure: Trigonal crypto-crystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Hardness
6
Color
Dyed vibrant blue (naturally gray/white)
Luster
Vitreous to waxy
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Physical properties

Hardness: 6.5-7 (Mohs); Color: Dyed vibrant blue (naturally gray/white); Luster: Vitreous to waxy; Structure: Trigonal crypto-crystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in cavities of volcanic rocks or ancient lavas. Silica-rich groundwater percolates into bubbles (vesicles), depositing layers of chalcedony over thousands of years. This specific specimen has been chemically dyed.

Uses & applications

Decorative display, geophysics education, jewelry making, and metaphysical collecting. Sliced and polished to highlight internal banding.

Geological facts

While the banding and crystal center are natural, true blue agate is rare and usually a pale lavender-blue. This intense neon-blue is achieved by soaking the porous rock in chemical salts like potassium ferricyanide or ferrous sulfate.

Field identification & locations

Identified by concentric banding and a druzy quartz center. Look for unnaturally bright colors or dye concentrated in cracks to distinguish from natural blue lace agate. Common in Brazil and Uruguay.

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