mineral

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Hardness: 6.5–7 (Mohs scale); Color: Intense fuchsia/magenta (dyed); Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.64

Hardness: 6
Color: Intense fuchsia/magenta (dyed)
Luster: Vitreous to waxy

Identified April 13, 2026More mineral →

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Physical properties

Hardness: 6.5–7 (Mohs scale); Color: Intense fuchsia/magenta (dyed); Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.64

Formation & geological history

Formed as chalcedony in volcanic rock cavities (vugs) via silica-rich groundwater. The intense pink color is achieved post-extraction through a chemical dyeing process, as this hue does not occur naturally in agate.

Uses & applications

Used primarily for decorative items, jewelry (beads, pendants), and as 'pocket stones' for collectors or gift shops.

Geological facts

Agate is porous, which allows it to absorb liquid dyes. This has been a common practice in the gemstone industry for centuries, especially with specimens from Brazil and Uruguay.

Field identification & locations

Identify in the field by its banded structure and conchoidal fracture. For dyed specimens, the color often concentrates in cracks or bands. Common in many geological settings worldwide, particularly basalt flows.

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