sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, colorless to brownish exterior with white crystal interior, hexagonal crystal system.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, colorless to brownish exterior with white crystal interior, hexagonal crystal system.
Formation & geological history
Formed in hollow spaces in sedimentary or volcanic rocks where silica-rich groundwater precipitated mineral crystals over millions of years.
Uses & applications
Used primarily in mineral collections, decorative display pieces, and sometimes in lapidary arts.
Geological facts
Geodes appear as ordinary, unassuming rocks on the outside but reveal dazzling crystal formations when cracked open.
Field identification & locations
Identified by its rounded, nodular shape externally and sparkling quartz crystals lining an inner cavity; commonly found in limestone formations worldwide.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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