sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, variable coloration with white, clear, or brownish tones, vitreous luster, and hexagonal crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, variable coloration with white, clear, or brownish tones, vitreous luster, and hexagonal crystal structure.
Formation & geological history
Formed via the deposition of silica-rich groundwater within cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Utilized primarily as decorative collector specimens, in crystal healing, and as source material for lapidary arts.
Geological facts
Geodes start as hollow bubbles in rock, gradually lined with inward-growing mineral crystals over geological time.
Field identification & locations
Easily identified by a rugged, bumpy outer shell concealing a sparkling interior cavity of quartz crystals; found worldwide in limestone and volcanic deposits.
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Sedimentary limestone with invertebrate fossil imprint
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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