Dyed Agate

Hardness: 6.5-7 on Mohs scale. Color: Polychromatic due to artificial dyeing (grey, bright orange/red band, green). Luster: Waxy to vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Agates generally form as nodules in volcanic rocks or ancient lavas, in former cavities produced by volatiles in the original molten mass. The coloration seen in this specimen (particularly the bright green and red/orange banding) is often the result of artificial dyeing processes applied to natural, less colorful agate to enhance its appearance for jewelry.

Primarily used in jewelry making, ornamental carvings, and decorative items. Very common in lapidary work.

Agate consists of chalcedony and quartz as its primary components. Because it is porous, it takes artificial dyes very well, a practice that has been done since Roman times to create vivid, unnatural colors.

Identified by its waxy luster, translucency, and distinct banding (though colored artificially). Common worldwide, with major deposits in Brazil and Uruguay. Collectors should be aware of dyed specimens compared to natural colors.