mineral

Dyed Blue Agate Slice

Chalcedony (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

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

Identified July 8, 2026More mineral →

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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.