sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and hexagonal crystal system. Color ranges from clear to white with brownish iron oxide staining.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and hexagonal crystal system. Color ranges from clear to white with brownish iron oxide staining.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside gas cavities or nodules within sedimentary or volcanic rocks over millions of years.
Uses & applications
Used widely in decorative displays, crystal specimen collecting, and lapidary arts.
Geological facts
Geodes start as hollow nodules where crystals grow inward toward the center, creating a hollow cavity lined with sparkling quartz points.
Field identification & locations
Easily identified by its rounded exterior and sparkling crystalline interior cavity; commonly found in limestone formations and desert regions worldwide.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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