mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, clear to white color with green inclusions, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, clear to white color with green inclusions, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed in hollow cavities in sedimentary or volcanic rocks where silica-rich groundwater precipitates quartz crystals over thousands to millions of years.
Uses & applications
Used in crystal healing, decorative items, lapidary arts, and gemstone collections.
Geological facts
Geodes start as bubbles in volcanic rock or animal burrows in sedimentary rock, gradually filling with mineral-rich water to grow inward-facing crystals.
Field identification & locations
Easily identified by its exterior rounded rock shell and sparkling internal crystal cavity; commonly found in limestone formations, deserts, and volcanic regions worldwide.
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