sedimentary
Agate Geode
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure with concentric banding, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure with concentric banding, and no cleavage.
Formation & geological history
Formed via groundwater depositing silica in hollow cavities of volcanic or sedimentary rocks over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, jewelry, and as a popular mineral collector specimen.
Geological facts
Geodes form when mineral-rich water seeps into a hollow cavity and slowly crystallizes inward from the outer walls.
Field identification & locations
Identified by its distinctive conchoidal fracture, layered banding, and cavity structure lined with microcrystalline quartz.
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