mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2) with artificial pigment

Hardness: 6.5-7.0 (Mohs scale); Color: Artificial deep blue, teal, or navy; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.

Hardness: 6
Color: Artificial deep blue, teal, or navy
Luster: Vitreous to waxy

Identified May 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich groundwater filling cavities in volcanic rocks. While the agate is natural (millions of years old), the color is achieved by soaking the porous chalcedony in chemical solutions (like iron or potassium ferrocyanide) and heating it.

Uses & applications

Used primarily in decorative items, jewelry (beads, cabochons), bookends, and as healing stones in the metaphysical community.

Geological facts

Natural blue agate exists (like Blue Lace Agate) but is usually much paler. These vibrant, dark blue tumbled stones are almost always the result of a dyeing process that has been used since Roman times to enhance the appearance of chalcedony.

Field identification & locations

Identify in the field by looking for translucent chalcedony nodules with banding. Dyed specimens are identified by color concentrated in cracks and a hue that does not occur naturally in such intensity throughout the stone. Found commonly in Brazil and Uruguay.

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