sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, transparent to white color, vitreous luster, hexagonal crystal system, and no true cleavage.
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Physical properties
Hardness of 7 on Mohs scale, transparent to white color, vitreous luster, hexagonal crystal system, and no true cleavage.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside hollow cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Widely collected as ornamental mineral specimens, used in jewelry, and occasionally utilized in crystal healing.
Geological facts
Geodes start as hollow bubbles in rock, often formed from animal burrows, tree roots, or gas pockets, which slowly line themselves with glittering quartz crystals.
Field identification & locations
Identify by its spherical exterior shell and glittering crystalline interior cavity; commonly found in limestone formations worldwide.
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Other sedimentary specimens
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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary