mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, colorless to white, with hexagonal crystal structures lining the interior cavity.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, colorless to white, with hexagonal crystal structures lining the interior cavity.
Formation & geological history
Formed when groundwater rich in silica deposits minerals inside hollow cavities within sedimentary or volcanic rocks over millions of years.
Uses & applications
Used widely in decorative displays, jewelry making, and as popular specimens for mineral and rock collectors.
Geological facts
Geodes start as gas bubbles in volcanic rock or nodules in limestone, eventually allowing quartz crystals to grow inward from the outer shell.
Field identification & locations
Easily identified by their rounded, dull exterior and sparkling crystal-filled interior when cracked open; found globally, notably in Brazil and Mexico.
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