mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5-7 (Mohs); Color: Naturally gray/white but dyed vibrant blue; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.64.

Hardness: 6
Color: Naturally gray/white but dyed vibrant blue
Luster: Waxy to vitreous

Identified February 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary deposits in hollow cavities (geodes) of volcanic rocks (igneous) through the deposition of silica-rich groundwater. Agate formation takes millions of years throughout various geological eras.

Uses & applications

Primarily used for decorative purposes, lapidary arts, jewelry (cabochons), bookends, and 'tumbled stones' for collectors or metaphysical use.

Geological facts

Natural agate rarely occurs in this saturated shade of neon blue. Most blue agates on the market, like this specimen, are dyed using inorganic salts to enhance the aesthetic appeal and highlight the internal banding patterns.

Field identification & locations

Identify in the field by its waxy luster and translucency when held to light. To check for dye, look for concentrated pockets of pigment in cracks. Found globally in Brazil, Uruguay, and the USA (notably Lake Superior region).

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