File:Geode_inside_outside.jpg · Wikimedia Commons · See Wikimedia Commons
geode
Sign in to savethumb|Quartz-filled geode, shown from inside (top) and outside (bottom)
~5 min read
Encyclopedic overview
8 sectionsContents
- Formation
- Coloration
- Occurrence
- Crystal caves
- See also
- References
- Further reading
- External links
thumb|Quartz-filled geode, shown from inside (top) and outside (bottom)
A geode (; ) is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
Excerpted from Wikipedia’s “geode” article, available under the CC BY-SA 4.0 licence.