mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to clear color, vitreous to sugary luster, and trigonal crystal system with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to clear color, vitreous to sugary luster, and trigonal crystal system with conchoidal fracture.
Formation & geological history
Formed when silica-rich groundwater deposits crystals inside hollow cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Used in decorative items, lapidary art, crystal collections, and sometimes as a source of industrial silica.
Geological facts
Geodes start as hollow nodules in rock; mineral-laden water slowly seeps inward, precipitating microscopic crystals that grow larger over time.
Field identification & locations
Easily identified by a rounded exterior nodule containing a sparkling, crystal-lined interior cavity; commonly found in limestone deserts and volcanic deposits.
