mineral

Dyed Agate

SiO2 (Silicon Dioxide)

AI-generated identification · may be incorrect

Hardness: 6.5-7, Color: Bright purple/magenta (artificially dyed), Luster: Vitreous to waxy (polished), Crystal structure: Cryptocrystalline (chalcedony), Specific gravity: 2.58-2.64

Hardness: 6

Identified September 24, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Bright purple/magenta (artificially dyed), Luster: Vitreous to waxy (polished), Crystal structure: Cryptocrystalline (chalcedony), Specific gravity: 2.58-2.64

Formation & geological history

Agate forms in nodules in volcanic rocks or ancient lavas, in former cavities produced by volatiles in the original molten mass. The bright purple color is the result of artificial dyeing of a natural, lighter-colored agate.

Uses & applications

Used in inexpensive jewelry, craft projects, and as decorative collector items.

Geological facts

Agate is highly porous, making it an excellent candidate for artificial dyeing. The practice of dyeing agates has been around since ancient Roman times.

Field identification & locations

Identified by its waxy luster, hardness (will scratch glass), and the artificially bright, sometimes uneven color concentration in bands or fractures. Commonly sourced from Brazil or Uruguay before dyeing.