mineral
Polished green agate (likely dyed)
Chalcedony, microcrystalline SiO₂; agate variety
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; green, translucent to opaque, waxy-to-glassy luster, cryptocrystalline quartz. The rounded polish and unusually uniform vivid green suggest possible dye treatment; the image alone cannot confirm it.
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Physical properties
Hardness 6.5–7 Mohs; green, translucent to opaque, waxy-to-glassy luster, cryptocrystalline quartz. The rounded polish and unusually uniform vivid green suggest possible dye treatment; the image alone cannot confirm it.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing chalcedony in layers over time. Deposits occur across many geological ages, commonly in basalt and other volcanic rocks.
Uses & applications
Tumbled agate is used in jewelry, ornaments, and mineral collections; agate is also used for small carvings and decorative objects.
Geological facts
Agate is valued for banding and patterns, though some commercial green agates are dyed to enhance color.
Field identification & locations
Look for translucent edges, waxy luster, and (in natural material) fine curved bands; hardness and a close inspection can help distinguish it from glass or imitation stone. Agate is found worldwide, including Brazil, Uruguay, India, and the United States.
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