gemstone
Tumbled Agate (Dyed Blue)
Silicon Dioxide (Chalcedony variety)
Hardness of 6.5 to 7 on the Mohs scale, vitreous to waxy luster, microcrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, vitreous to waxy luster, microcrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.60 to 2.65.
Formation & geological history
Formed in cavities of volcanic and metamorphic rocks through the deposition of silica-rich groundwater solutions over millions of years. Often subsequently tumbled, polished, and artificially dyed blue.
Uses & applications
Commonly used in lapidary arts, jewelry making, ornamental objects, and as a popular specimen for rock and crystal collectors.
Geological facts
Agate has been used since antiquity for ornaments, seals, and healing talismans. Many brightly colored agates on the market, such as this blue variety, are artificially dyed to enhance their visual appeal.
Field identification & locations
Identified by its smooth tumbled feel, waxy or glass-like luster, and lack of cleavage. Often found worldwide where ancient volcanic or sedimentary activity occurred.
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