mineral

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Hardness: 6.5-7 (Mohs scale); Color: Artificial blue/cyan bands (natural is usually gray/white); Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.64.

Hardness: 6
Color: Artificial blue/cyan bands (natural is usually gray/white)
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed as nodules in volcanic rocks or ancient lavas, where silica-rich groundwater fills cavities. The vibrant blue color is not natural; it is achieved through a dyeing process where porous layers of the agate absorb pigments.

Uses & applications

Primarily used in jewelry making, ornamental carvings, beads, and metaphysical specimens for collectors.

Geological facts

Agate has been used as a gemstone for over 3,000 years. The practice of dyeing agate dates back to the Roman Empire, as natural agate is often quite porous and takes color well.

Field identification & locations

Identify by searching for concentric or parallel banding patterns. In the field, look for nodules with a waxy exterior. For dyed pieces, notice if the color is concentrated in the cracks or specific bands, which indicates artificial enhancement.

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