mineral
Quartz geode (druzy quartz)
Quartz, SiO₂, lining a cavity in a pale host rock
AI-generated identification · may be incorrectThe cavity contains small, clear-to-tan, glassy quartz crystals; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The outer matrix appears pale and granular, but its composition cannot be identified reliably from the image.
Identified More mineral →
Explore Quartz geode (druzy quartz) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
The cavity contains small, clear-to-tan, glassy quartz crystals; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The outer matrix appears pale and granular, but its composition cannot be identified reliably from the image.
Formation & geological history
Quartz crystals grew from silica-rich fluids inside a cavity in the host rock. The specimen’s age and exact geological setting cannot be determined from appearance alone.
Uses & applications
Druzy quartz is collected and used in jewelry and decorative pieces; quartz also has major industrial uses in glassmaking and electronics.
Geological facts
Druzy describes a surface covered with many tiny crystals, rather than a distinct mineral species.
Field identification & locations
Look for a cavity lined with hard, glassy crystals; quartz scratches glass and does not show strong cleavage. Quartz geodes occur in many regions, including Brazil, Uruguay, and the United States.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous