sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, vitreous luster, colorless to white crystals, hexagonal crystal system, specific gravity 2.65.
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Physical properties
Hardness of 7 on Mohs scale, vitreous luster, colorless to white crystals, hexagonal crystal system, specific gravity 2.65.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside hollow cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Used primarily as decorative ornamental items, lapidary art, jewelry, and for metaphysical purposes.
Geological facts
Geodes appear as ordinary, rough spherical rocks on the outside, but cracking them open reveals glittering crystal linings.
Field identification & locations
Found worldwide in limestone formations and volcanic ash beds; identified by its rounded, nodular exterior and hollow crystalline interior.
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Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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