Mineral

Dyed Blue Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on the Mohs scale; Color: Variable (this specimen is dyed deep blue and white); Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal) microcrystalline; Cleavage: None, exhibits conchoidal fracture

Hardness: 6
Color: Variable (this specimen is dyed deep blue and white)
Luster: Vitreous to waxy

Identified April 2, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in volcanic cavities (vesicles) or sedimentary rock through the deposition of silica from groundwater; however, the vibrant blue color is the result of industrial dyeing processes using inorganic salts.

Uses & applications

Commonly used in jewelry (pavements, beads, cabochons), home decor, tumbled pocket stones for metaphysical use, and as a popular entry-level collector specimen.

Geological facts

Natural blue agate (like Blue Lace Agate) is typically very pale. The intense, saturated dark blue seen in this tumbled stone is almost always achieved by soaking porous chalcedony in a solution of iron salts or chemicals then heating it.

Field identification & locations

Identify in the field by its waxy luster and translucency. Artificial dye can often be spotted by 'pooling' of color in hairline fractures or a hue that does not occur naturally in nature. Commonly found globally in Brazil, Uruguay, and India.