sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, trigonal crystal system, white to yellowish-brown coloration, and conchoidal fracture.
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, vitreous luster, trigonal crystal system, white to yellowish-brown coloration, and conchoidal fracture.
Formation & geological history
Formed in hollow cavities of sedimentary or volcanic rocks where silica-rich groundwater precipitates mineral crystals over millions of years.
Uses & applications
Widely collected as decorative mineral specimens, utilized in crystal healing, and sometimes used in jewelry making.
Geological facts
Geodes often start as nodules in limestone or basalt, with the inner cavity developing sparkling quartz or chalcedony linings.
Field identification & locations
Easily identified by a rounded exterior shell with a sparkling, hollow crystalline interior. Commonly sourced from regions like Brazil, Mexico, and the United States.
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