sedimentary
Quartz Geode
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, whitish outer chalcedony shell with a hollow cavity lined by microcrystalline or macrocrystalline quartz crystals, vitreous luster.
Identified More sedimentary →
Explore Quartz Geode in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, whitish outer chalcedony shell with a hollow cavity lined by microcrystalline or macrocrystalline quartz crystals, vitreous luster.
Formation & geological history
Formed in sedimentary or volcanic rock cavities where mineral-rich groundwater deposits silica over millions of years.
Uses & applications
Popular in lapidary arts, mineral collecting, and metaphysical uses due to its decorative crystal-lined interior.
Geological facts
Geodes start as hollow bubbles in rock, such as gas pockets in lava or animal burrows in mud, slowly filling outward from the edges.
Field identification & locations
Found in limestone formations and volcanic regions worldwide; easily identified by its spherical shape and hollow, sparkling center when cracked open.
More like this
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