File:Geode_inside_outside.jpg · Wikimedia Commons · See Wikimedia Commons
geode
thumb|Quartz-filled geode, shown from inside (top) and outside (bottom)
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8 sectionsContents
- Formation
- Coloration
- Occurrence
- Crystal caves
- See also
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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.