sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, and colorless to pinkish hues with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, and colorless to pinkish hues with conchoidal fracture.
Formation & geological history
Formed in hollow cavities of sedimentary or volcanic rocks through the slow precipitation of mineral-rich silica solutions over millions of years.
Uses & applications
Widely utilized in decorative items, lapidary arts, metaphysical practices, and mineral collections.
Geological facts
Geodes start as bubbles in volcanic rock or animal burrows in mud, gradually filling with sparkling quartz crystals lining the interior cavity.
Field identification & locations
Easily identified by their spherical outer shell and glittering crystal-filled interior when cracked open; 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