mineral
Polished, dyed blue agate slice
Agate, a banded variety of chalcedony (microcrystalline SiO₂)
AI-generated identification · may be incorrectMostly silica; Mohs hardness 6.5–7, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The specimen has polished, vivid blue-and-white bands; its strong blue color is likely enhanced by dyeing.
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Physical properties
Mostly silica; Mohs hardness 6.5–7, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The specimen has polished, vivid blue-and-white bands; its strong blue color is likely enhanced by dyeing.
Formation & geological history
Agate forms as silica-rich fluids deposit concentric or layered chalcedony in cavities, commonly in volcanic rocks. Its exact age and source cannot be determined from the image.
Uses & applications
Polished slices are used for décor, craft projects, and jewelry; agate is also collected as a lapidary material.
Geological facts
Agate banding records successive silica deposition, and commercial agates are often dyed to intensify their colors.
Field identification & locations
Look for translucent, curved or parallel bands and a glassy-to-waxy polish; blue coloration this vivid is a clue to treatment. Agates occur worldwide, notably in Brazil, Uruguay, Mexico, and the United States.
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