sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness 7, white to clear exterior with crystalline interior, vitreous luster, hexagonal crystal system, specific gravity 2.65.
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Physical properties
Mohs hardness 7, white to clear exterior with crystalline interior, vitreous luster, 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 in decorative items, lapidary art, crystal healing, and as mineral specimens for collectors.
Geological facts
Geodes start as hollow nodules in rock, often formed from animal burrows, tree roots, or gas bubbles.
Field identification & locations
Identified by its spherical exterior and sparkling crystal-lined interior cavity; found worldwide in limestone and volcanic formations.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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