mineral

Blue Agate Geode (Dyed)

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Artificial blue, white, and tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Artificial blue, white, and tan
Luster: Vitreous to waxy

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Artificial blue, white, and tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & geological history

Formed in cavities (vesicles) of volcanic rocks where silica-rich groundwater deposited layers of chalcedony over time. This specimen has been synthetically dyed to achieve the bright blue color.

Uses & applications

Primarily used for ornamental purposes, home decor, bookends, lapidary art, and as entry-level collector pieces.

Geological facts

Agate is a variety of chalcedony characterized by its fineness of grain and brightness of color. While natural blue agate exists (Blue Lace Agate), specimens with this specific neon saturation are almost always dyed.

Field identification & locations

Identified by concentric banding and a druzy quartz center. In the field, look for nodules with a waxy exterior and higher density than surrounding rock. Commonly found in Brazil and Uruguay.

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