mineral
Banded Agate
Silicon Dioxide (SiO2)
Hardness 6.5-7 on Mohs scale; translucent to opaque waxy luster; microcrystalline trigonal structure; distinct color banding in shades of brown, tan, grey, and white; no cleavage.
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Physical properties
Hardness 6.5-7 on Mohs scale; translucent to opaque waxy luster; microcrystalline trigonal structure; distinct color banding in shades of brown, tan, grey, and white; no cleavage.
Formation & geological history
Formed through the deposition of silica from groundwater within cavities inside volcanic rocks (such as basalt) or sedimentary host formations.
Uses & applications
Popular for lapidary work, tumbling, jewelry making, cabochons, decorative ornaments, and mineral collection.
Geological facts
Banded agates display characteristic concentric or parallel lines created by layer-by-layer mineral deposition under varying hydrothermal conditions.
Field identification & locations
Identify in the field by smooth, waxy surface texture, translucent edges, and fine parallel or concentric banding. Commonly found along riverbeds, gravel bars, and volcanic terrains.
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