Mineral

Dyed Agate

Agate (SiO2)

Hardness of 6.5-7 on the Mohs scale. Microcrystalline quartz (chalcedony). Exhibits banded patterns. Luster is waxy to vitreous. The bright colors in this specimen (blue and red/orange) are indicative of artificial dyeing.

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in nodules in volcanic rocks or ancient lavas. Silica-rich waters percolate through rock cavities, depositing microscopic quartz crystals in concentric layers. The specimen has been artificially dyed after mining.

Uses & applications

Commonly used in inexpensive jewelry, ornamental carvings, and home decor items like bookends and coasters.

Geological facts

Agates are highly porous, which makes them very susceptible to artificial dyes. The practice of dyeing agates has been around since Roman times. While brightly colored dyed agates are popular, natural agates usually have more subdued colors.

Field identification & locations

Identify by its waxy luster, conchoidal fracture, and characteristic banding. The unusually vibrant, unnatural blue and orange colors indicate human enhancement. Found globally, with primarily sources in Brazil, Uruguay, and the USA.