Mineral
Agate
Cryptocrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, highly variable color often with banding, waxy to vitreous luster, cryptocrystalline structure, no cleavage, specific gravity 2.58-2.64
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Physical properties
Hardness 6.5-7 on Mohs scale, highly variable color often with banding, waxy to vitreous luster, cryptocrystalline structure, no cleavage, specific gravity 2.58-2.64
Formation & geological history
Formed primarily in volcanic and metamorphic rocks from silica-rich fluids filling cavities and cooling slowly over millions of years.
Uses & applications
Used extensively in jewelry, lapidary arts, ornamental objects, and historically for hardstone carving and some industrial grinding tools.
Geological facts
Agate is a variety of chalcedony characterized by its fineness of grain and brightness of color. It forms in concentric layers in a wide variety of colors and textures.
Field identification & locations
Identified by its distinctive banding, waxy luster, and high hardness. Commonly found worldwide in areas with historic volcanic activity. Collectors look for unique patterns and vibrant, contrasting colors.
