mineral
Dyed Agate
SiO2 (Silicon Dioxide)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale. Microcrystalline quartz structure. Highly polished luster. The vibrant blue color is artificially achieved through dyeing, as natural agate is typically banded in more muted tones. Specific gravity is ~2.6.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Microcrystalline quartz structure. Highly polished luster. The vibrant blue color is artificially achieved through dyeing, as natural agate is typically banded in more muted tones. Specific gravity is ~2.6.
Formation & geological history
Agate forms as nodules in volcanic rocks or ancient lavas, filling cavities produced by volatiles. The banded structure is a result of rhythmic crystallization. The bright blue color seen here is a result of a post-mining dyeing process.
Uses & applications
Commonly used in inexpensive jewelry, ornamental carvings, and as decorative tumbled stones for collectors.
Geological facts
Dyeing agate is a practice that dates back to the ancient Romans, who figured out how to artificially enhance the colors of these porous stones.
Field identification & locations
Identified by its distinctive banding (even when dyed) and glassy luster when polished. It is very common worldwide, with major deposits in Brazil and Uruguay.
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