mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
Hardness of 6.5 to 7 on the Mohs scale, predominantly beige/tan with lighter banding, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, predominantly beige/tan with lighter banding, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.60 to 2.65.
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, often over millions of years.
Uses & applications
Commonly used for lapidary work, jewelry, ornamental items, and crystal healing or collecting.
Geological facts
Agate is a diverse form of chalcedony that often forms in concentric bands around a core, taking on colors from iron and other impurities.
Field identification & locations
Easily identified by its hardness, conchoidal fracture, and subtle waxy luster; found worldwide in volcanic rock cavities.
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