mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Hardness: 6.5-7 on Mohs scale. Color: Naturally gray/white, but artificially dyed blue. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (cryptocrystalline). Cleavage: None. Specific Gravity: 2.58-2.64.

Hardness: 6
Color: Naturally gray/white, but artificially dyed blue
Luster: Vitreous to waxy

Identified June 27, 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 (vesicles). The concentric banding represents different stages of mineral deposition. This specific specimen has been chemically dyed to enhance its blue appearance.

Uses & applications

Used primarily for decorative purposes, jewelry (pendants, beads), coasters, bookends, and in metaphysical practices/collecting.

Geological facts

Agate is named after the Achates River in Sicily. While blue lace agate occurs naturally, the vibrant teal and deep blue tones seen in this thin slice are almost always the result of a dyeing process where the porous layers of the stone absorb pigment.

Field identification & locations

Identify in the field by its waxy luster and characteristic concentric banding. Frequently found in Brazil, Uruguay, and the USA. This specimen is a 'nodule slice' or 'agate slab.'

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