sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically yellowish to brown outer rind with internal clear or amber quartz crystals, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65
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, typically yellowish to brown outer rind with internal clear or amber quartz crystals, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65
Formation & geological history
Formed in hollow spaces in sedimentary or volcanic rocks, where silica-rich groundwater gradually precipitates quartz crystals over millions of years
Uses & applications
Used as decorative specimens, crystal healing, and in jewelry or lapidary arts
Geological facts
Geodes start as hollow nodules or cavities in rock, often formed from animal burrows, tree roots, or gas bubbles in volcanic lava, which are slowly lined with mineral crystals
Field identification & locations
Can be identified in the field by looking for distinctive round or oval nodule shapes that feel unusually heavy and hollow when cracked open; commonly found in limestone formations
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary